Frost Dates: First and last frost dates for Silver Lake Rs, 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 August 4, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around July 25, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before July 17, 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° May 16 May 7 Apr 30 Apr 24 Apr 18 Apr 13 Apr 7 Mar 31 Mar 22
Last 20° Jun 16 Jun 6 May 30 May 23 May 17 May 12 May 5 Apr 28 Apr 18
Last 24° Jul 8 Jun 30 Jun 23 Jun 18 Jun 13 Jun 8 Jun 3 May 28 May 19
Last 28° Jul 28 Jul 20 Jul 14 Jul 9 Jul 5 Jun 30 Jun 26 Jun 20 Jun 12
Last 32° Aug 3 Jul 28 Jul 24 Jul 20 Jul 17 Jul 14 Jul 10 Jul 6 Jun 30
Last 36° Aug 4 Aug 1 Jul 29 Jul 27 Jul 25 Jul 22 Jul 20 Jul 17 Jul 14

ℹ️ How to read these charts for the fall

As summer ends in Silver Lake Rs, 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 2, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By August 9, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By August 17, 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 August 17 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° Sep 25 Oct 3 Oct 9 Oct 14 Oct 18 Oct 23 Oct 28 Nov 3 Nov 11
First 20° Sep 9 Sep 17 Sep 22 Sep 27 Oct 1 Oct 5 Oct 10 Oct 15 Oct 23
First 24° Aug 21 Aug 29 Sep 4 Sep 9 Sep 13 Sep 18 Sep 23 Sep 29 Oct 7
First 28° Aug 3 Aug 10 Aug 14 Aug 18 Aug 22 Aug 26 Aug 30 Sep 4 Sep 10
First 32° Jul 30 Aug 2 Aug 5 Aug 7 Aug 9 Aug 12 Aug 14 Aug 17 Aug 21
First 36° Jul 31 Aug 1 Aug 2 Aug 3 Aug 4 Aug 5 Aug 6 Aug 7 Aug 9

📍 Frost Dates for other nearby locations

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