Frost Dates: First and last frost dates for Stilwell, OK

ℹ️ How to read these charts for the spring

As spring unfolds, the risk of frost gradually decreases each day until your tender plants are finally safe. The probabilities shown in the chart help you make smart decisions about when to plant.

While frost typically forms at 32°F, tender plants can be damaged even when temperatures are slightly higher. Air temperatures are often measured several feet above the ground, but temperatures at plant level can be several degrees colder. Protected areas like porches help by blocking radiational cooling. Given these variables, we consider 36°F the "caution zone" for frost-sensitive plants.

Key dates for your spring planting:

  • By May 8, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around April 24, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before April 15, there's still an 80% risk of frost — too early for tomatoes and other tender plants unless you're prepared to protect them

If the 10-day forecast shows no temperatures below 40°F, you might safely plant earlier than the above dates suggest. Many gardeners watch for this weather window to get a head start on the growing season.

In the Spring
Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
Last 16° Mar 9 Mar 1 Feb 24 Feb 19 Feb 15 Feb 10 Feb 5 Jan 31 Jan 23
Last 20° Mar 23 Mar 15 Mar 9 Mar 4 Feb 28 Feb 23 Feb 18 Feb 13 Feb 5
Last 24° Apr 1 Mar 26 Mar 21 Mar 18 Mar 14 Mar 11 Mar 7 Mar 3 Feb 25
Last 28° Apr 13 Apr 8 Apr 4 Apr 1 Mar 29 Mar 26 Mar 23 Mar 20 Mar 15
Last 32° Apr 23 Apr 19 Apr 16 Apr 14 Apr 11 Apr 9 Apr 7 Apr 4 Mar 31
Last 36° May 8 May 3 Apr 30 Apr 27 Apr 24 Apr 21 Apr 18 Apr 15 Apr 10

ℹ️ How to read these charts for the fall

As summer ends in Stilwell, OK, nighttime temperatures begin to drop, and your risk of frost increases with each passing day. Knowing when to expect frost helps you harvest sensitive crops and extend your growing season with protection methods.

The chart below shows the probability of experiencing specific temperatures on various dates. Here's what this means for your garden:

1
Early warning: Around October 11, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By October 23, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By November 4, there's an 80% chance of seeing 32°F — most tender plants will be damaged without protection
4
Another perspective: You have only a 1 in 5 chance of making it past November 4 without a freezing night

These probabilities help you time your end-of-season harvests and know when to apply protective measures like row covers, cloches, or cold frames to extend your harvest.

In the Fall
Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
First 16° Nov 12 Nov 23 Dec 1 Dec 8 Dec 14 Dec 21 Dec 27 Jan 4 Jan 16
First 20° Nov 9 Nov 16 Nov 21 Nov 25 Nov 29 Dec 3 Dec 7 Dec 12 Dec 19
First 24° Oct 26 Nov 1 Nov 6 Nov 10 Nov 14 Nov 18 Nov 22 Nov 26 Dec 3
First 28° Oct 23 Oct 28 Nov 1 Nov 5 Nov 8 Nov 11 Nov 14 Nov 18 Nov 24
First 32° Oct 5 Oct 11 Oct 16 Oct 20 Oct 23 Oct 27 Oct 30 Nov 4 Nov 10
First 36° Sep 26 Sep 30 Oct 4 Oct 7 Oct 9 Oct 12 Oct 15 Oct 19 Oct 23

📍 Frost Dates for other nearby locations

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Data is provided by the NOAA National Centers for Environmental Information.