Frost Dates: First and last frost dates for leavenworth, 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 June 23. 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 May 19, so we don't dare plant that early. We wait a few days and by June 2 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 15 Mar 6 Feb 28 Feb 23 Feb 18 Feb 13 Feb 8 Feb 2 Jan 24
Last 20° Mar 25 Mar 18 Mar 13 Mar 9 Mar 5 Mar 1 Feb 24 Feb 19 Feb 12
Last 24° Apr 18 Apr 11 Apr 5 Apr 1 Mar 28 Mar 24 Mar 19 Mar 14 Mar 7
Last 28° May 6 May 1 Apr 27 Apr 24 Apr 21 Apr 18 Apr 15 Apr 12 Apr 7
Last 32° May 28 May 22 May 18 May 15 May 12 May 9 May 5 May 2 Apr 26
Last 36° Jun 23 Jun 16 Jun 11 Jun 6 Jun 2 May 29 May 24 May 19 May 12

How to read these charts for the fall
As your growing season comes to an end, the nightly temperatures for leavenworth, 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 15, and by October 8 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 20.
  2. There is a 50% chance of being hit by a 32° frost starting around September 29
  3. You have a 80% chance of seeing 32° by October 8
  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° Nov 13 Nov 21 Nov 26 Dec 1 Dec 5 Dec 10 Dec 14 Dec 20 Dec 27
First 20° Oct 26 Nov 3 Nov 9 Nov 14 Nov 19 Nov 23 Nov 28 Dec 4 Dec 12
First 24° Oct 14 Oct 19 Oct 23 Oct 26 Oct 29 Nov 1 Nov 4 Nov 8 Nov 13
First 28° Sep 26 Oct 1 Oct 5 Oct 9 Oct 12 Oct 15 Oct 18 Oct 22 Oct 28
First 32° Sep 15 Sep 20 Sep 23 Sep 26 Sep 29 Oct 1 Oct 4 Oct 8 Oct 12
First 36° Sep 6 Sep 10 Sep 13 Sep 16 Sep 19 Sep 21 Sep 24 Sep 27 Oct 1

Frost Dates for other nearby locations
  • Plain, WA
  • Wenatchee, WA
  • Cle Elum, WA
  • Wenatchee Pangborn Memorial, WA
  • Waterville, WA
  • Holden Village, WA
  • Ellensburg, WA
  • Chelan, WA
  • Stampede Pass, WA
  • Stehekin, WA

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