When should I plant lettuce in ZIP 74103?

In ZIP 74103, the main lettuce target is around Mar 22, based on the representative Tulsa frost station and USDA zone 7b.

When should I start lettuce seeds indoors in 74103?

Start lettuce seeds indoors in ZIP 74103 around Mar 8, about 28 days before the Apr 5 last-frost estimate.

Is this a guaranteed planting date?

No. GrowZone uses frost-date estimates, hardiness zones, and crop timing rules for planning. Local microclimates and current weather can shift the right date.

ZIP 74103 planting calendar

When to plant lettuce in Tulsa, OK - Zone 7b

Q: When is the first frost in Tulsa?

Tulsa (ZIP 74103) has an average first fall frost around Oct 30, leaving about 208 frost-free days.

In ZIP 74103, plant lettuce around Mar 22; this uses the Tulsa frost station, USDA zone 7b, and lettuce timing rules.

Your Tulsa calendar has a 208-day estimated frost-free season. This estimate uses the representative Tulsa frost station, USDA zone 7b, and lettuce timing rules.

Source: tulsa-intl frost station, USDA zone 7b, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

USDA zone 7b Tulsa frost station Oklahoma State University Extension Updated 2026-06-28

Read the method

Answer first

When to start lettuce seeds indoors in Tulsa

In ZIP 74103, start lettuce seeds indoors around Mar 8, about 28 days before the Apr 5 last-frost estimate.

Start lettuce seeds indoors in Tulsa around Mar 8, about 28 days before the Apr 5 last-frost estimate.

Seed starting schedule

Lettuce dates for Tulsa, OK

Step	Date	How to use it
Start Indoors	March 8, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	March 22, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	March 22, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Tulsa?

Tulsa (ZIP 74103) has an average last spring frost around Apr 5.

First frost

When is the first frost in Tulsa?

The average first fall frost is around Oct 30, giving about 208 frost-free days.

Season map

Lettuce windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Mar 8

Direct sow

Mar 22

Transplant

Mar 22

Harvest

May 16

Frost watch

Sep 5

Reminder workflow

Every date has a next action

Start lettuce indoorsMar 8

Direct sow lettuceMar 22

Transplant lettuceMar 22

Last frost windowApr 5

First lettuce harvest windowMay 16

Last lettuce sowing targetSep 5

Signal	Value	Why it matters
Last frost estimate	April 5, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	October 30, 2026	Fall planting counts backward from this date.
Season length	208 days	Longer seasons can support succession crops.
Spacing	8-12 in	Airflow and root space affect yield.
Soil temperature	40 F+	Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

Tulsa frost history and USDA zone 7b shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

Oklahoma State University Extension is the kind of local source to verify against when a crop is expensive, weather is unusual, or your yard has a cold pocket.

Crop note

Lettuce timing notes

Succession sow every 10-14 days while weather is cool. Lettuce prefers sun to part shade, 8-12 in spacing, and soil near 40 F+.

For fall, count backward from Oct 30. A conservative last sowing target is around Sep 5.