When should I plant basil in ZIP 73102?

In ZIP 73102, the main basil target is around Apr 15, based on the representative Oklahoma City frost station and USDA zone 7b.

When should I start basil seeds indoors in 73102?

Start basil seeds indoors in ZIP 73102 around Mar 1, about 35 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 73102 planting calendar

When to plant basil in Oklahoma City, OK - Zone 7b

Q: When is the first frost in Oklahoma City?

Oklahoma City (ZIP 73102) has an average first fall frost around Oct 30, leaving about 208 frost-free days.

In ZIP 73102, plant basil around Apr 15; this uses the Oklahoma City frost station, USDA zone 7b, and basil timing rules.

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

Source: oklahoma-city-will-rogers 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 Oklahoma City frost station Oklahoma State University Extension Updated 2026-06-28

Read the method

Answer first

When to start basil seeds indoors in Oklahoma City

In ZIP 73102, start basil seeds indoors around Mar 1, about 35 days before the Apr 5 last-frost estimate.

Start basil seeds indoors in Oklahoma City around Mar 1, about 35 days before the Apr 5 last-frost estimate.

Seed starting schedule

Basil dates for Oklahoma City, OK

Step	Date	How to use it
Start Indoors	March 1, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	April 15, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	April 15, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Oklahoma City?

Oklahoma City (ZIP 73102) has an average last spring frost around Apr 5.

First frost

When is the first frost in Oklahoma City?

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

Season map

Basil windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Mar 1

Direct sow

Apr 15

Transplant

Apr 15

Harvest

Jun 19

Frost watch

Aug 26

Reminder workflow

Every date has a next action

Start basil indoorsMar 1

Last frost windowApr 5

Direct sow basilApr 15

Transplant basilApr 15

First basil harvest windowJun 19

Last basil sowing targetAug 26

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	10-12 in	Airflow and root space affect yield.
Soil temperature	65 F+	Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

Oklahoma City 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

Basil timing notes

Pinch the growing tips early for fuller plants. Basil prefers full sun, 10-12 in spacing, and soil near 65 F+.

For fall, count backward from Oct 30. A conservative last sowing target is around Aug 26.