Frost Dates: First and last frost dates for Klamath Falls, OR

ℹ️ How to read these charts for the spring

As spring unfolds, the risk of frost gradually decreases each day until your tender plants are finally safe. The probabilities shown in the chart help you make smart decisions about when to plant.

While frost typically forms at 32°F, tender plants can be damaged even when temperatures are slightly higher. Air temperatures are often measured several feet above the ground, but temperatures at plant level can be several degrees colder. Protected areas like porches help by blocking radiational cooling. Given these variables, we consider 36°F the "caution zone" for frost-sensitive plants.

Key dates for your spring planting:

  • By July 12, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around June 27, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before June 18, there's still an 80% risk of frost — too early for tomatoes and other tender plants unless you're prepared to protect them

If the 10-day forecast shows no temperatures below 40°F, you might safely plant earlier than the above dates suggest. Many gardeners watch for this weather window to get a head start on the growing season.

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

ℹ️ How to read these charts for the fall

As summer ends in Klamath Falls, OR, nighttime temperatures begin to drop, and your risk of frost increases with each passing day. Knowing when to expect frost helps you harvest sensitive crops and extend your growing season with protection methods.

The chart below shows the probability of experiencing specific temperatures on various dates. Here's what this means for your garden:

1
Early warning: Around September 10, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By September 21, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By October 1, there's an 80% chance of seeing 32°F — most tender plants will be damaged without protection
4
Another perspective: You have only a 1 in 5 chance of making it past October 1 without a freezing night

These probabilities help you time your end-of-season harvests and know when to apply protective measures like row covers, cloches, or cold frames to extend your harvest.

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

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