Frost Dates: First and last frost dates for circleville, 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 3. 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 6, so we don't dare plant that early. We wait a few days and by June 17 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 6 Apr 2 Mar 29 Mar 24 Mar 17
Last 20° May 11 May 6 May 2 Apr 28 Apr 25 Apr 22 Apr 19 Apr 15 Apr 9
Last 24° May 23 May 18 May 15 May 12 May 9 May 6 May 3 Apr 29 Apr 24
Last 28° Jun 10 Jun 4 May 31 May 28 May 24 May 21 May 17 May 13 May 8
Last 32° Jun 25 Jun 19 Jun 15 Jun 12 Jun 8 Jun 5 Jun 1 May 28 May 22
Last 36° Jul 3 Jun 27 Jun 23 Jun 20 Jun 17 Jun 14 Jun 10 Jun 6 Jun 1

How to read these charts for the fall
As your growing season comes to an end, the nightly temperatures for circleville, 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 September 6, and by September 24 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 September 10.
  2. There is a 50% chance of being hit by a 32° frost starting around September 17
  3. You have a 80% chance of seeing 32° by September 24
  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 18 Oct 22 Oct 26 Oct 28 Oct 31 Nov 3 Nov 6 Nov 9 Nov 14
First 20° Sep 29 Oct 5 Oct 10 Oct 13 Oct 17 Oct 20 Oct 24 Oct 29 Nov 4
First 24° Sep 20 Sep 25 Sep 29 Oct 2 Oct 5 Oct 8 Oct 12 Oct 15 Oct 21
First 28° Sep 12 Sep 17 Sep 20 Sep 22 Sep 25 Sep 27 Sep 30 Oct 3 Oct 7
First 32° Sep 6 Sep 10 Sep 13 Sep 15 Sep 17 Sep 19 Sep 22 Sep 24 Sep 28
First 36° Aug 22 Aug 27 Aug 31 Sep 4 Sep 7 Sep 10 Sep 13 Sep 17 Sep 22

Frost Dates for other nearby locations
  • Marysvale, UT
  • Panguitch, UT
  • Koosharem, UT
  • Bryce Canyon Np Hqrs, UT
  • Richfield Radio Ksvc, UT
  • Kanosh, UT
  • Parowan, UT
  • Alton, UT
  • Escalante, UT
  • Fillmore, UT

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