Crop · winter lettuce · not a yield

Growing winter lettuce in a high tunnel

Growers search high-tunnel winter lettuce when they want season extension after the field crop is done — then row cover, drip, fabric, and film after the frame lands. This page copies land-grant sentences and tonight’s live Amazon featured prices. It is not a recipe, not a heads-per-bed table, and not a USDA payment.

Extension PDFs and pages retrieved 21 September 2026, about 03:08 UTC. Featured Amazon prices copied 21 September 2026, about 03:09 UTC. Bootstrap Farmer frost-blanket Shopify JSON copied 21 September 2026, about 03:08 UTC. EQIP language is the structure-only FAQ already on what EQIP will not pay for. No payment dollar or pounds-per-square-foot is invented here.

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Why winter lettuce goes in a high tunnel

UAEX MP586, fetched tonight, names winter-grown lettuces as a tunnel crop moving up the list. Rutgers FS1267 is written as a high-tunnel winter-lettuce sheet. Purdue HO-330 and HO-297 treat lettuce as a cool-season crop under row cover. Cornell says lettuce holds late fall and early spring, not the dead of winter. This page does not invent a head price.

Winter-grown lettuces, however, are quickly moving up the list of profitable high tunnel crops.

Season Extension: Within a high tunnel air and soil temperatures warm more quickly in the spring and stay warmer longer in the fall. This allows for earlier crop establishment, accelerated growth, and earlier harvests in the spring and extends harvest later into the fall.

Favorable growing environments can also be maintained within a high tunnel through the winter months to support out-of-season production of many cold hardy crops.

A high tunnel’s plastic cover can protect plants from environmental stresses including late spring frosts, hail, heavy rain (particularly during vulnerable growing stages), and wind. High tunnels also allow for crop maintenance and harvests despite weather conditions, such as rain.

Source: University of Arkansas System Division of Agriculture — High Tunnel Production Guide for Arkansas and the Southeast (MP586). Retrieved 21 September 2026, about 03:08 UTC.

Winter lettuce is a crop that is seeded or transplanted in a high tunnel or other protected structure after the traditional planting season.

Winter lettuce planting takes place from late summer through the fall, and lettuce is harvested during the cooler months.

Many types of lettuce are suitable for winter production in high tunnels, including Butterhead, Romaine, and baby leaf types.

Producing winter lettuce in high tunnels provides a lower-input option to traditional heated greenhouse production.

Source: Melendez — Ultra-Niche Crops Series: High Tunnel Winter Lettuce (Rutgers NJAES FS1267). Rutgers also printed yield estimates on that page. Those pounds and heads-per-1,000-square-feet are not copied here.

High tunnels are plastic-covered structures, big enough to walk in, that provide protection from wind, snow, ice and, with strategic use of row covers, from the coldest temperatures.

The hardiest cool season crops can survive all winter in high tunnels. Less hardy cool season crops can be grown before and after the coldest part of the winter.

lettuce can be grown as “cut and come again” greens, or harvested just once as a complete head.

Source: Purdue Extension HO-330-W — High Tunnels: Scheduling Fall and Winter Vegetable Production (Maynard and Hilfinger). Cut-and-come-again is a harvest method, not a yield table.

This publication primarily covers unheated high tunnels and the use of internal row covers. In the Midwest, cool-season crops are grown in these structures from about September through March. Crops include leafy greens such as kale, chard, lettuce, mustard, and spinach; head-forming brassicas such as bok choy; and root crops including radishes and turnips.

Source: Purdue Extension HO-297-W — Managing the Environment in High Tunnels for Cool Season Vegetable Production. Midwest September–March window, not a national calendar.

High tunnels can also make it possible to produce leafy greens and herbs during the winter.

They provide protection from unfavorable weather conditions, including wind, hail, frost, and excessive rainfall.

Source: University of Kentucky Center for Crop Diversification CCD-SP-2 — High Tunnel Overview. UKY printed dated per-square-foot construction ranges in that PDF. Those dollars are not copied here.

Lettuce is not spinach in January

Cornell lists lettuce with the late-fall / early-spring greens, not the dead-of-winter set. Purdue HO-330 still treats head lettuce as a single-harvest crop that can sit in a living refrigerator if row cover and venting hold. Those two sentences sit together on purpose. This page does not invent a January harvest date.

These greens are generally hardy late in fall/early spring, but not in the dead of winter: Lettuce

These greens are generally hardy in tunnels under row covers without heat in the dead of winter: Spinach, Mache, Claytonia, Minutina, Tat soi and some other Asian greens.

Powdery mildew on lettuce is a big problem under low light and high humidity conditions in late fall and early winter. (Lettuce is usually not hardy through the dead of winter.)

Winter production of greens relies on “banking” greens that grow in late fall for later winter harvest.

Source: Cornell High Tunnels — Greens (structures, cultural practices, winter hardiness). Cornell also printed salad-mix and spinach pounds-per-square-foot on that page. Those yields are not copied here.

A common approach to growing cold-tolerant crops in unheated high tunnels during the fall-spring in Northern climates is to plant beds in the late summer/early fall so that plants are mature by end of November, at the latest, at which point plant growth slows considerably until early February. Crops can then be harvested from November-February, using the tunnel as a “living refrigerator” and picking as needed.

Planting Dates are recommended for Zone 6a, and should be adjusted roughly one week back for Zone 5b and one week forward for Zone 6b.

This plan is for single-layer tunnels.

Source: Purdue Extension HO-330-W — High Tunnels: Scheduling Fall and Winter Vegetable Production (Maynard and Hilfinger). Zone 6a scheduling, not a national planting chart. Purdue printed yield figures in that PDF. Those pounds are not copied here.

Winter lettuce can be planted from September through October for multiple harvests. Seven- to ten-day seeding intervals are recommended when multiple harvest dates are desired.

Days to harvest can range from 60 to 80 days, depending on temperatures.

Source: Melendez — Ultra-Niche Crops Series: High Tunnel Winter Lettuce (Rutgers NJAES FS1267). New Jersey September–October window and days-to-harvest, not a 20×40 calendar.

Tomato weeks versus a fall greens planting

Purdue HO-330’s September sentence is about spinach, not lettuce, and it is already on high-tunnel tomatoes. It still belongs here as the scheduling question: keep the summer crop, or plant a cool-season bed. Rutgers plants winter lettuce from September through October. This page does not invent a profit.

To help in deciding whether to remove a summer crop in the high tunnel in order to plant spinach, it can be helpful to think of the potential profit for each week of high tunnel use. For instance, if tomatoes are in the tunnel in September, what is the potential profit from those for the first two weeks – and how does that compare to the potential profit from planting spinach the first of September versus the 15th?

Source: Purdue Extension HO-330-W — High Tunnels: Scheduling Fall and Winter Vegetable Production (Maynard and Hilfinger). Scheduling question, not a payment or a stem count.

Footprint — typical house, not a bed plan

Kit width × length stays on the size pages. UKY’s overview names a typical 15-to-30-ft width and 60-to-96-ft length. Cornell asks for height that holds daytime heat. Rutgers prints 10-to-12-inch head spacing and 4-to-6-inch baby-leaf rows. None of those is a required lettuce size, and none is a plant count for a 14×20 or a 20×40.

Typical tunnels are 9 to 15 feet tall, 15 to 30 feet wide, and 60 to 96 feet long.

Source: University of Kentucky Center for Crop Diversification CCD-SP-2 — High Tunnel Overview. Typical range, not a kit-index SKU. 30×96 list price and freight stay on the 30×96 cost page.

A higher, taller structure holds heat collected during the day from solar gain better than a shorter, narrower one.

Source: Cornell High Tunnels — Greens (structures, cultural practices, winter hardiness). Heat-holding sentence, not a required peak height and not a snow-load rating.

Loose head lettuce plants should be planted with 10 to 12" between plants and rows.

Baby leaf lettuces should be direct-seeded into close rows 4–6" apart.

Source: Melendez — Ultra-Niche Crops Series: High Tunnel Winter Lettuce (Rutgers NJAES FS1267). Spacing sentences, not a 20×40 plant count. No bed plan is invented from them.

Size hub: high-tunnel sizes. 14×20 kits. 20×40 kits. 30×96 cost.

Manufacturer frost blanket, not a kit row

Bootstrap Farmer frost-blanket page, live tonight, names 0.9 oz and 1.5 oz 20-foot packs. Those SKUs are not extra rows on the 9-kit index. Kit frames stay on manufacturer product pages. The vendor’s own temperature-protection table is not copied here.

Amazon parts after the house is up

Frost blanket, floating row cover, drip tape, tubing, emitters, aisle fabric, staples, film, and shade. Titles and featured prices copied 21 September 2026, about 03:09 UTC. A missing featured price stays an em dash. Tomato-clip ASINs that were live tonight stay on that crop page.

As an Amazon Associate, we earn from qualifying purchases.

Opened and skipped or left on sibling pages: B077TC4KXN — Opened (Agfabric 0.9 oz 10×50 frost blanket). No featured priceAmount tonight. Skipped.; B00TQT9LC4 — Opened (Agfabric 1.5 oz 7×50 row cover). No featured priceAmount tonight. Skipped.; B01HKXRV92 — Opened (Agfabric 2.0 oz 5×25 frost cloth). No featured priceAmount tonight. Skipped.; B01HKWKD84 — Opened. Same 0.55 oz 5×25 listing as B01BU13PJK (featured $15.79). Left as the B01BU13PJK row.; B0DYP23DP6 — Opened (Pemaly hooks + clips). Featured priceAmount $30.99 tonight. Left on the tomato page — clip hardware, not a lettuce row-cover row.; B08DXXJX9Y — Opened (Jiggly snap clamps). Featured priceAmount $21.50 tonight. Left on roll-up sides.

Row cover, drip, film, and shade — existing hubs

Purdue HO-330 assumes medium-weight cover below 25°F and a double layer below 10°F. Rutgers names floating covers inside the house. UAEX calls the same cloth a secondary cover, row cover, or frost blanket. Cornell prints 5–10 F on hoops and says pull it by day for light. The frost-blanket rows above are listings — not a fertigation or cover design. Filter, regulator, stakes, and manifold stay on high-tunnel drip irrigation.

All harvest ranges assume that the grower would use at least medium-weight row cover over beds within the tunnel when nighttime temperatures drop below 25°F and double layer cover if nighttime temperatures drop below 10°F.

For single-harvest crops (beets, carrots, radish/ specialty turnip, head lettuce and scallions), the harvest range provides an estimate of the length of time in which the crop can remain in the ground and still be marketable, assuming that row cover is used according to the above guidelines and high tunnels are vented so as to not allow temperatures above 80°F.

Source: Purdue Extension HO-330-W — High Tunnels: Scheduling Fall and Winter Vegetable Production (Maynard and Hilfinger). Scheduling assumption, not a SKU mandate.

A secondary cover, often called a row cover or frost blanket, is made from lightweight material and placed over a row (or multiple rows) of plants. Mimicking the high tunnel’s ability to capture heat, the air beneath a secondary cover can be a few degrees (~2-5°F) warmer than the ambient air inside the high tunnel.

Row covers can come in different thicknesses (0.5 – 2.0 oz/sq. yd), with thicker covers offering more frost protection than a thinner fabric.

Row covers are often suspended above the plants using hoops or other means, but they can also be placed directly on the plants.

Any secondary cover will reduce the amount of light available to plants with heavier fabrics reducing light more than a lighter fabric. A thicker frost cloth can reduce available light by 50 percent or more.

The use of secondary covers may also be necessary during the winter and shoulder seasons, requiring additional labor hours to cover/ uncover plants.

Source: University of Arkansas System Division of Agriculture — High Tunnel Production Guide for Arkansas and the Southeast (MP586). About 2–5°F is UAEX’s secondary-cover sentence, not a national rating and not a vendor table.

Row covers are another important means of reducing heat loss. These are typically lightweight, breathable fabrics placed over one or more beds or rows, sometimes resting directly on the crop, and sometimes supported slightly above the crop using hoops or frames of wire or conduit (Fig. 8).

Row covers come in different weights: heavier ones provide more insulation but block more light if they are left on during the day.

Without a row cover, DLI at plant level averaged 72% of outside DLI. With a row cover, DLI at plant level averaged 48% of outside DLI. Keeping the row cover on all day reduced light available to plants by about 1/3.

on the other date a lightweight (0.55 oz./sq.yd.), spun-bonded polyester row cover was over the plants for the entire day. The two tunnels were each covered with a single layer of plastic.

Even with a lightweight row cover, removing it during the day can increase the light to the crop.

It is important to be prepared to vent the tunnel to keep temperatures below 80°F.

Source: Purdue Extension HO-297-W — Managing the Environment in High Tunnels for Cool Season Vegetable Production. Pinney Purdue 0.55 oz./sq.yd. trial method, not a SKU mandate.

Floating row covers can be used to protect the plants from temperature fluctuations. Row covers used inside a high tunnel add additional insulation to the crop. However, careful consideration should be given when using row cover, as this will reduce airflow around the crop and increase the chances of foliar disease. Row covers will also reduce light intensity.

Drip irrigation is recommended, but irrigate only when needed.

Lettuce leaves should be kept as dry as possible to reduce the incidence of foliar disease such as gray mold, and lettuce drop.

Source: Melendez — Ultra-Niche Crops Series: High Tunnel Winter Lettuce (Rutgers NJAES FS1267).

Medium-weight row cover supported on hoops gives 5-10 F warmth, more on colder nights.

But those covers must be removed during the day for light transmission.

Source: Cornell High Tunnels — Greens (structures, cultural practices, winter hardiness). 5–10 F is Cornell’s hoop-cover sentence, not a degrees rating for any Amazon pack.

Row covers used in conjunction with the high tunnel will provide additional cold and frost protection. Because row covers also block sunlight, they should not be left on for prolonged periods during the winter. Placing the row covers over hoops will help to keep tender leaves from freezing to the fabric.

Source: University of Kentucky Center for Crop Diversification CCD-SP-2 — High Tunnel Overview.

In a high tunnel, plants are most often grown directly in the existing soil and irrigated using drip systems.

Source: University of Arkansas System Division of Agriculture — High Tunnel Production Guide for Arkansas and the Southeast (MP586).

High tunnels must be placed near a viable source for irrigation. NRCS requires proof that legal access to water exists, regardless of how irrigation is obtained, before a high tunnel system can be designed for implementation. Oregon NRCS has a worksheet that is required to be signed by a verified authority confirming legal access to water. Some farms may be exempt.

Source: USDA NRCS High Tunnel System Initiative FAQ (Updated November 2024; Oregon-branded). Siting rule, not a drip-parts payment.

Film comparison stays on plastic replacement. Shade comparison stays on shade cloth. Purdue HO-330’s dates assume a single-layer house. UAEX MP586 still calls shade cloth necessary for summer production in Arkansas.

Other costs include plastic replacement, which will need to be done every three to five years, shade cloth (necessary for summer production in Arkansas), irrigation systems and labor to install these coverings.

Source: University of Arkansas System Division of Agriculture — High Tunnel Production Guide for Arkansas and the Southeast (MP586). Arkansas summer note, not a national shade mandate.

Landscape staples that pin aisle fabric or a frost blanket are compared on ground anchors. Ground posts for the frame stay on ground posts.

Kit pieces that matter for winter lettuce

Cornell wants gable vents for warm winter spells plus roll-up sides in milder weather. Purdue vents so the house does not sit above 80°F. Whether a listed kit includes roll-up sides, end walls, or ground posts is already sourced on those pages — not invented here.

Gable vents are important for venting during warm spells in the winter, (in addition to roll-up sides used during warmer weather).

Source: Cornell High Tunnels — Greens (structures, cultural practices, winter hardiness). Ventilation sentence, not a kit-index feature.

• Roll-up sides — included, optional, omitted, or not stated.
• End walls and doors — steel, zipper add-on, brackets, or left open.
• Ventilation fans — HAF, exhaust, thermostats, wax auto vents. Passive roll-up and end-wall pages stay linked above.
• How to heat a high tunnel — inner frost cloth, soil heat, vented heaters, CO risk. Crop scheduling stays on this page.
• Ground posts — posts, stakes, or not stated. Not a wind table.
• High-tunnel tomatoes — the summer crop that may still be in the house in September; clips and twine stay there.
• High-tunnel strawberries — the other crop page; mulch rows stay there.
• High-tunnel cut flowers — the rotation sibling; netting rows stay there.

EQIP is the house, not the crop

Row cover, drip, and shade are grower cost. The FAQ already on this site says the practice pays for the structure. The same FAQ allows soil-profile or raised-bed crops and lists benches and pots among uses that sit outside the practice. UKY tells EQIP growers to check the state standard before treating a heater as allowed.

Under the High Tunnel System Initiative, financial assistance is provided only for the structure itself. Electricity, venting systems, lighting, etc. can be installed providing the additions meets manufacturer’s designs and specifications. However, the grower is responsible for those costs.

Source: USDA NRCS High Tunnel System Initiative FAQ (Updated November 2024; Oregon-branded).

High tunnels can be used for crops that are grown in the natural soil profile or in raised beds.

Source: USDA NRCS High Tunnel System Initiative FAQ (Updated November 2024; Oregon-branded). Raised beds in the soil profile are named. The same FAQ lists Crops grown on benches or in pots among uses that sit outside the practice; that list is already on what EQIP will not pay for.

A grower who has received Natural Resources Conservation Service (NRCS) Environmental Quality Incentives Program (EQIP) funds to purchase a high tunnel should check his/her state’s NRCS High Tunnel System Conservation Practice Standard to make sure heaters are allowed.

Source: University of Kentucky Center for Crop Diversification CCD-SP-2 — High Tunnel Overview. Check the county. This page does not invent a heater payment.

Rules vary; call your county NRCS office. Checklist: EQIP county inspection. What sits outside cost share: what EQIP will not pay for.

FAQ

Does EQIP pay for row cover, drip tape, or shade cloth for winter lettuce?

The High Tunnel System Initiative FAQ says financial assistance is provided only for the structure itself, and that the grower is responsible for additions such as electricity, venting, and lighting. Row cover, frost blanket, drip tape, landscape fabric, staples, and shade cloth sit with those grower costs. This page does not invent a payment dollar. Rules vary; call your county NRCS office.

What size high tunnel for winter lettuce?

UKY CCD-SP-2 says typical tunnels are 9 to 15 feet tall, 15 to 30 feet wide, and 60 to 96 feet long. Cornell says a higher, taller structure holds daytime solar heat better than a shorter, narrower one. Purdue HO-330’s planting dates are for Zone 6a in a single-layer house. Those are land-grant size sentences, not a required width × length and not a plant count for a 14×20 or 20×40. Kit footprints stay on the size hub and the 14×20, 20×40, and 30×96 pages. No bed plan is invented here.

Do I need row cover inside a high tunnel for winter lettuce?

Purdue HO-330 assumes at least medium-weight row cover over beds when nighttime temperatures drop below 25°F, and a double layer below 10°F. Rutgers FS1267 says floating row covers inside a high tunnel add insulation, cut airflow, and cut light. UAEX MP586 calls a secondary cover a row cover or frost blanket and prints about 2–5°F warmer air under it. Cornell says lettuce is generally hardy late in fall and early spring, but not in the dead of winter, and that medium-weight cover on hoops gives 5–10 F warmth. Those are land-grant sentences, not a SKU mandate. Manufacturer frost-blanket SKUs and Amazon listings on this page are pack sizes only.

Can I plant winter lettuce after high-tunnel tomatoes?

Purdue HO-330 frames the September choice as tomato weeks versus planting spinach the first or the 15th of September — a scheduling sentence, not a profit number. Rutgers FS1267 plants winter lettuce from September through October. UAEX MP586 names winter-grown lettuces as a tunnel crop. This page does not invent a head count or a second-crop payment. Tomato clips and twine stay on the tomatoes page.

Does EQIP pay for benches, pots, heaters, or a lettuce crop?

The High Tunnel System Initiative FAQ says high tunnels can be used for crops grown in the natural soil profile or in raised beds, and it lists crops grown on benches or in pots among uses that sit outside the practice. The same FAQ says financial assistance is provided only for the structure itself. UKY CCD-SP-2 tells EQIP growers to check the state CPS 325 before treating heaters as allowed. This page does not invent a lettuce-crop payment, a heater payment, or a marketing payment. Rules vary; call your county NRCS office.

Rules vary; call your county NRCS office. Tunnel Spec does not determine eligibility, payment rates, or inspection outcomes. As an Amazon Associate, we earn from qualifying purchases.