When is the last frost in Tulsa, OK?

The average (50% probability) last spring frost in Tulsa is March 31, based on NOAA 1991–2020 normals. A 1-in-10 risk remains until April 15.

When is the first frost in Tulsa?

The average first fall frost in Tulsa is November 4, with a growing season of about 220 days.

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Tulsa, Oklahoma frost dates

Average last spring frost: March 31. Average first fall frost: November 4. That gives a growing season of about 220 days. For frost-tender plants, a safer planting date is April 15, after which a freeze happens in only 1 year in 10.

Last frost (50%)

Mar 31

1-in-10 risk after Apr 15

First frost (50%)

Nov 4

1-in-10 risk before Oct 20

Growing season

220 days

median frost-free days

Hard freeze (28°F)

Mar 17

median last 28°F in spring

Frost risk by date

Chance of frost	Spring: frost after	Fall: frost before
90%	March 11	November 19
70%	March 23	November 9
50%	March 31	November 4
30%	April 5	October 30
10%	April 15	October 20

Read the spring column like this: there is a 10% chance of a 32°F freeze after April 15. These are NOAA probabilities for the Tulsa International Airport weather station (USW00013968, elevation 198 m), 1991–2020.

Tulsa vegetable planting calendar

Dates count from the 50% last-frost date (March 31). For tomatoes, peppers and other frost-tender crops, waiting until the 10% date (Apr 15) is the cautious choice.

Crop	Start seeds indoors	Plant out
Beans	Mar 10	Apr 7 (usually sown directly in the garden)
Broccoli	Jan 20	Mar 3
Brussels sprouts	Jan 20	Mar 3
Cabbage	Jan 13	Feb 24
Cauliflower	Feb 3	Mar 17
Sweet corn	Mar 3	Mar 31 (usually sown directly in the garden)
Cucumbers	Mar 17	Apr 7
Kale	Jan 13	Feb 24
Leeks	Dec 16	Feb 24
Lettuce	Feb 10	Mar 17
Melons	Mar 24	Apr 14
Onions	Dec 9	Feb 17 (from seed; sets and transplants go out at the same time)
Peas	Feb 3	Mar 3 (usually sown directly in the garden)
Peppers	Feb 17	Apr 14
Squash	Mar 24	Apr 14
Tomatoes	Feb 3	Mar 31

Offsets from Oregon State University Extension's seed-starting table. "Plant out" means transplant, or sow directly for crops usually grown from seed.

Fall frost and season extension

The first fall freeze usually arrives around November 4. There's a 1-in-10 chance it comes before October 20. Harvest tender crops such as basil, tomatoes, peppers and squash before then, or cover them on cold nights. Cool-season crops like kale, cabbage and Brussels sprouts handle light frost, and often taste sweeter after it. A hard freeze (28°F) typically comes around November 13.

Nearby cities

City	Last frost (50%)	First frost (50%)	Distance
Oklahoma City, OK	Apr 4	Nov 2	~178 km
Wichita, KS	Apr 11	Oct 29	~213 km
Springfield, MO	Apr 9	Oct 27	~251 km
Topeka, KS	Apr 12	Oct 23	~320 km
Kansas City, MO	Apr 13	Oct 24	~359 km
Little Rock, AR	Mar 21	Nov 10	~365 km

More: all Oklahoma frost dates