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

How to read these charts for the spring
As the growing season approaches, the days get longer, the weather begins to warm up, and the nights start being less cold. You're still getting frost, but the chance of nightly frosts gets less and less with each passing day. Eventually, the frost stops, and this is when your tender plants are fully safe. So, how do you plan for this? The probabilities on this page help you assess your risk of frost on any given day.

What's a safe temperature for tender plants? When the nightly temperature falls, frost can form, even above 32°, because the air is colder high above the ground and the frost can form up there and then fall down onto your garden and do some damage, even if it's 36° on the ground. So many factors come into play, including wind, concrete, houses, trees and other structures, etc etc etc. Because of all this, you might want to consider 36° as "the danger zone".

In your average springtime, you have a 90% chance that there will be no 36° nights by July 21. In other words, you can pretty much count on being safe from frost by that day. But we want to get those tomatoes in the ground as soon as possible, right? We see that there's still an 80% chance of 36° on June 17, so we don't dare plant that early. We wait a few days and by July 1 we are at the 50/50 point. At this point, we are close and we can start watching the weather forecast. If the upcoming week's forecast doesn't show below 40°, then it's probably okay to risk planting out your plants.

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

How to read these charts for the fall
As your growing season comes to an end, the nightly temperatures for Kamas, UT start to go down, and therefore every day that goes by increases the chance that you'll get frost. Your risk of frost really begins around August 24, and by September 20 you're almost certain to have received at least one frost event.

The charts on this page show the probabilities of receiving a certain temperature on a certain day. Some examples that might help:

  1. You have a small 20% chance of getting 32° by August 30.
  2. There is a 50% chance of being hit by a 32° frost starting around September 10
  3. You have a 80% chance of seeing 32° by September 20
  4. Said another way, you have a 1 in 5 chance at making it to that day without a 32° night.
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
  • Heber, UT
  • Wanship Dam, UT
  • Snake Creek Powerhouse, UT
  • Coalville, UT
  • Silver Lake Brighton, UT
  • Deer Creek Dam, UT
  • Echo Dam, UT
  • Alta, UT
  • Mtn Dell Dam, UT
  • Timpanogos Cave, UT

    Or enter a new zipcode:

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