Frost Dates: First and last frost dates for Davenport, WA

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 15. 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 15, so we don't dare plant that early. We wait a few days and by June 27 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° Mar 11 Mar 4 Feb 26 Feb 22 Feb 18 Feb 13 Feb 9 Feb 4 Jan 27
Last 20° Apr 25 Apr 13 Apr 5 Mar 29 Mar 22 Mar 16 Mar 8 Feb 28 Feb 16
Last 24° May 11 May 3 Apr 27 Apr 22 Apr 18 Apr 13 Apr 8 Apr 3 Mar 26
Last 28° May 24 May 18 May 14 May 10 May 7 May 3 Apr 29 Apr 25 Apr 19
Last 32° Jun 21 Jun 14 Jun 9 Jun 5 Jun 1 May 28 May 24 May 19 May 13
Last 36° Jul 15 Jul 9 Jul 4 Jul 1 Jun 27 Jun 23 Jun 20 Jun 15 Jun 9

How to read these charts for the fall
As your growing season comes to an end, the nightly temperatures for Davenport, WA 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 3, and by October 2 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 9.
  2. There is a 50% chance of being hit by a 32° frost starting around September 20
  3. You have a 80% chance of seeing 32° by October 2
  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 20 Oct 29 Nov 4 Nov 10 Nov 15 Nov 20 Nov 25 Dec 1 Dec 10
First 20° Oct 7 Oct 16 Oct 22 Oct 27 Nov 1 Nov 6 Nov 11 Nov 17 Nov 26
First 24° Sep 28 Oct 5 Oct 9 Oct 13 Oct 17 Oct 20 Oct 24 Oct 29 Nov 4
First 28° Sep 13 Sep 19 Sep 23 Sep 27 Sep 30 Oct 4 Oct 8 Oct 12 Oct 18
First 32° Sep 3 Sep 9 Sep 13 Sep 17 Sep 20 Sep 24 Sep 28 Oct 2 Oct 8
First 36° Aug 15 Aug 21 Aug 25 Aug 29 Sep 2 Sep 5 Sep 9 Sep 13 Sep 19

Frost Dates for other nearby locations
  • Harrington, WA
  • Wellpinit, WA
  • Wilbur, WA
  • Ritzville, WA
  • Odessa, WA
  • Spokane, WA
  • Chewelah, WA
  • Lind, WA
  • St. John, WA
  • Coulee Dam, WA

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