Frost Dates: First and last frost dates for Beulah, 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 3, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around June 16, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before June 6, 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° Mar 28 Mar 20 Mar 13 Mar 8 Mar 3 Feb 26 Feb 21 Feb 15 Feb 6
Last 20° Apr 24 Apr 14 Apr 7 Apr 1 Mar 27 Mar 21 Mar 16 Mar 9 Feb 27
Last 24° May 5 Apr 27 Apr 22 Apr 18 Apr 14 Apr 10 Apr 6 Apr 1 Mar 25
Last 28° May 28 May 21 May 16 May 11 May 7 May 3 Apr 29 Apr 24 Apr 16
Last 32° Jun 15 Jun 8 Jun 3 May 30 May 27 May 23 May 19 May 14 May 7
Last 36° Jul 3 Jun 27 Jun 23 Jun 20 Jun 16 Jun 13 Jun 10 Jun 6 May 31

ℹ️ How to read these charts for the fall

As summer ends in Beulah, 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 13, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By September 23, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By October 3, 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 3 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 24 Oct 30 Nov 4 Nov 8 Nov 12 Nov 15 Nov 19 Nov 24 Nov 30
First 20° Oct 12 Oct 17 Oct 21 Oct 24 Oct 27 Oct 30 Nov 2 Nov 6 Nov 11
First 24° Oct 1 Oct 5 Oct 9 Oct 12 Oct 14 Oct 17 Oct 20 Oct 23 Oct 28
First 28° Sep 18 Sep 23 Sep 26 Sep 29 Oct 2 Oct 4 Oct 7 Oct 10 Oct 15
First 32° Sep 7 Sep 13 Sep 17 Sep 20 Sep 23 Sep 26 Sep 29 Oct 3 Oct 9
First 36° Aug 29 Sep 3 Sep 6 Sep 9 Sep 11 Sep 14 Sep 16 Sep 19 Sep 24

📍 Frost Dates for other nearby locations

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