Frost Dates: First and last frost dates for Long Creek, 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 24, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around July 8, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before June 28, 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 6 Mar 28 Mar 22 Mar 16 Mar 11 Mar 6 Mar 1 Feb 22 Feb 13
Last 20° Apr 27 Apr 20 Apr 15 Apr 10 Apr 6 Apr 2 Mar 29 Mar 24 Mar 17
Last 24° May 17 May 10 May 4 Apr 30 Apr 26 Apr 22 Apr 17 Apr 12 Apr 5
Last 28° Jun 14 Jun 6 May 31 May 26 May 21 May 16 May 12 May 6 Apr 28
Last 32° Jul 8 Jun 30 Jun 25 Jun 20 Jun 15 Jun 11 Jun 6 Jun 1 May 24
Last 36° Jul 24 Jul 19 Jul 15 Jul 11 Jul 8 Jul 5 Jul 2 Jun 28 Jun 22

ℹ️ How to read these charts for the fall

As summer ends in Long Creek, 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 August 31, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By September 10, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By September 19, 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 September 19 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 27 Nov 4 Nov 10 Nov 16 Nov 20 Nov 25 Dec 1 Dec 7 Dec 15
First 20° Oct 5 Oct 13 Oct 19 Oct 24 Oct 29 Nov 3 Nov 8 Nov 13 Nov 21
First 24° Sep 26 Oct 2 Oct 6 Oct 9 Oct 12 Oct 16 Oct 19 Oct 23 Oct 29
First 28° Sep 10 Sep 15 Sep 19 Sep 22 Sep 25 Sep 28 Oct 1 Oct 5 Oct 10
First 32° Aug 27 Aug 31 Sep 4 Sep 7 Sep 10 Sep 12 Sep 15 Sep 19 Sep 24
First 36° Aug 6 Aug 12 Aug 17 Aug 20 Aug 24 Aug 27 Aug 31 Sep 4 Sep 10

📍 Frost Dates for other nearby locations

Or enter a new zipcode:

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