Frost Dates: First and last frost dates for Kamas, UT

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 July 21, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around July 1, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before June 17, 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° Apr 26 Apr 19 Apr 14 Apr 10 Apr 7 Apr 3 Mar 30 Mar 25 Mar 18
Last 20° May 13 May 7 May 2 Apr 28 Apr 24 Apr 21 Apr 17 Apr 12 Apr 5
Last 24° May 22 May 16 May 11 May 7 May 4 Apr 30 Apr 27 Apr 22 Apr 16
Last 28° Jun 14 Jun 8 Jun 3 May 31 May 27 May 23 May 20 May 15 May 9
Last 32° Jun 30 Jun 25 Jun 22 Jun 18 Jun 15 Jun 12 Jun 9 Jun 6 May 31
Last 36° Jul 21 Jul 14 Jul 9 Jul 5 Jul 1 Jun 27 Jun 22 Jun 17 Jun 10

ℹ️ How to read these charts for the fall

As summer ends in Kamas, UT, 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 August 30, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By September 10, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By September 20, 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 September 20 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° Oct 10 Oct 16 Oct 21 Oct 25 Oct 28 Nov 1 Nov 5 Nov 10 Nov 16
First 20° Sep 28 Oct 5 Oct 10 Oct 15 Oct 19 Oct 23 Oct 28 Nov 2 Nov 10
First 24° Sep 11 Sep 18 Sep 22 Sep 27 Sep 30 Oct 4 Oct 8 Oct 13 Oct 20
First 28° Sep 8 Sep 13 Sep 17 Sep 20 Sep 22 Sep 25 Sep 28 Oct 1 Oct 6
First 32° Aug 24 Aug 30 Sep 3 Sep 6 Sep 10 Sep 13 Sep 16 Sep 20 Sep 26
First 36° Aug 10 Aug 16 Aug 21 Aug 25 Aug 28 Sep 1 Sep 5 Sep 9 Sep 16

📍 Frost Dates for other nearby locations

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