Frost Dates: First and last frost dates for Weaverville, CA

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 June 30, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around June 11, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before May 29, 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° Feb 28 Feb 14 Feb 3 Jan 24 Jan 14 Jan 3 Dec 20 -- --
Last 20° Apr 17 Mar 30 Mar 17 Mar 6 Feb 23 Feb 12 Jan 31 Jan 16 Dec 18
Last 24° May 5 Apr 23 Apr 15 Apr 8 Apr 1 Mar 26 Mar 19 Mar 10 Feb 27
Last 28° May 20 May 12 May 7 May 3 Apr 28 Apr 24 Apr 19 Apr 14 Apr 7
Last 32° Jun 10 Jun 3 May 29 May 25 May 21 May 16 May 12 May 7 Apr 30
Last 36° Jun 30 Jun 24 Jun 19 Jun 15 Jun 11 Jun 7 Jun 3 May 29 May 23

ℹ️ How to read these charts for the fall

As summer ends in Weaverville, CA, 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 25, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By October 6, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By October 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 October 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° Nov 13 Nov 28 Dec 9 Dec 20 Dec 30 Jan 12 Jan 30 -- --
First 20° Oct 26 Nov 8 Nov 17 Nov 26 Dec 3 Dec 11 Dec 20 Dec 31 Jan 21
First 24° Oct 13 Oct 22 Oct 29 Nov 3 Nov 8 Nov 14 Nov 19 Nov 26 Dec 5
First 28° Oct 2 Oct 8 Oct 13 Oct 17 Oct 21 Oct 25 Oct 29 Nov 3 Nov 10
First 32° Sep 19 Sep 25 Sep 29 Oct 3 Oct 6 Oct 9 Oct 13 Oct 17 Oct 23
First 36° Aug 30 Sep 6 Sep 11 Sep 15 Sep 18 Sep 22 Sep 26 Oct 1 Oct 7

📍 Frost Dates for other nearby locations

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