Frost Dates: First and last frost dates for Paisley, OR

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 25, so we don't dare plant that early. We wait a few days and by July 5 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 17 Apr 5 Mar 28 Mar 21 Mar 14 Mar 8 Mar 1 Feb 20 Feb 9
Last 20° May 4 Apr 26 Apr 20 Apr 15 Apr 10 Apr 5 Mar 31 Mar 24 Mar 16
Last 24° May 21 May 14 May 9 May 5 May 2 Apr 28 Apr 24 Apr 19 Apr 12
Last 28° Jun 7 May 31 May 26 May 22 May 18 May 13 May 9 May 4 Apr 27
Last 32° Jul 5 Jun 28 Jun 23 Jun 19 Jun 15 Jun 11 Jun 7 Jun 2 May 26
Last 36° Jul 21 Jul 15 Jul 11 Jul 8 Jul 5 Jul 2 Jun 29 Jun 25 Jun 19

How to read these charts for the fall
As your growing season comes to an end, the nightly temperatures for Paisley, OR 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 19, 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 26.
  2. There is a 50% chance of being hit by a 32° frost starting around September 8
  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 17 Oct 23 Oct 28 Nov 1 Nov 4 Nov 7 Nov 11 Nov 16 Nov 22
First 20° Oct 5 Oct 12 Oct 16 Oct 20 Oct 24 Oct 27 Oct 31 Nov 4 Nov 11
First 24° Sep 28 Oct 3 Oct 7 Oct 10 Oct 14 Oct 17 Oct 20 Oct 24 Oct 29
First 28° Sep 12 Sep 17 Sep 21 Sep 24 Sep 27 Sep 30 Oct 3 Oct 6 Oct 11
First 32° Aug 19 Aug 26 Aug 30 Sep 4 Sep 8 Sep 11 Sep 16 Sep 20 Sep 27
First 36° Aug 14 Aug 19 Aug 23 Aug 27 Aug 30 Sep 2 Sep 5 Sep 9 Sep 15

Frost Dates for other nearby locations
  • Valley Falls, OR
  • Summer Lake, OR
  • Lakeview, OR
  • Alkali Lake, OR
  • Silver Lake Rs, OR
  • The Poplars, OR
  • Adel, OR
  • Hart Mtn Refuge, OR
  • Sprague River, OR
  • Malin, OR

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