Frost Dates: First and last frost dates for Klamath Falls, 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 12. 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 18, 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° Apr 8 Mar 26 Mar 17 Mar 10 Mar 3 Feb 23 Feb 16 Feb 7 Jan 25
Last 20° May 4 Apr 23 Apr 16 Apr 9 Apr 3 Mar 28 Mar 22 Mar 14 Mar 3
Last 24° May 26 May 18 May 12 May 7 May 2 Apr 27 Apr 21 Apr 15 Apr 7
Last 28° Jun 17 Jun 9 Jun 3 May 29 May 24 May 19 May 14 May 8 Apr 29
Last 32° Jun 29 Jun 23 Jun 18 Jun 14 Jun 11 Jun 7 Jun 3 May 30 May 24
Last 36° Jul 12 Jul 7 Jul 3 Jun 30 Jun 27 Jun 25 Jun 21 Jun 18 Jun 13

How to read these charts for the fall
As your growing season comes to an end, the nightly temperatures for Klamath Falls, 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 September 5, and by October 1 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 21
  3. You have a 80% chance of seeing 32° by October 1
  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 29 Nov 5 Nov 10 Nov 15 Nov 19 Nov 23 Nov 27 Dec 2 Dec 9
First 20° Oct 18 Oct 23 Oct 27 Oct 30 Nov 2 Nov 5 Nov 8 Nov 12 Nov 17
First 24° Oct 2 Oct 7 Oct 11 Oct 14 Oct 18 Oct 21 Oct 24 Oct 28 Nov 2
First 28° Sep 21 Sep 26 Sep 29 Oct 2 Oct 5 Oct 7 Oct 10 Oct 13 Oct 18
First 32° Sep 5 Sep 10 Sep 14 Sep 17 Sep 21 Sep 24 Sep 27 Oct 1 Oct 6
First 36° Aug 27 Sep 1 Sep 4 Sep 7 Sep 10 Sep 12 Sep 15 Sep 18 Sep 23

Frost Dates for other nearby locations
  • Klamath Falls, OR
  • Tulelake, CA
  • Sprague River, OR
  • Malin, OR
  • Lava Beds Nm, CA
  • Mount Hebron Ranger Stn, CA
  • Howard Prairie Dam, OR
  • Crater Lake Nps Hq, OR
  • Prospect, OR
  • Ashland, OR

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