Frost Dates: First and last frost dates for Canby, 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 July 21, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
  • Around July 3, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
  • Before June 22, 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 18 Apr 8 Apr 1 Mar 26 Mar 20 Mar 15 Mar 9 Mar 2 Feb 20
Last 20° May 10 May 1 Apr 24 Apr 18 Apr 13 Apr 7 Apr 1 Mar 25 Mar 16
Last 24° May 26 May 19 May 15 May 11 May 7 May 3 Apr 29 Apr 25 Apr 18
Last 28° Jun 13 Jun 7 Jun 2 May 29 May 26 May 22 May 18 May 14 May 7
Last 32° Jul 2 Jun 25 Jun 20 Jun 15 Jun 11 Jun 7 Jun 3 May 29 May 22
Last 36° Jul 21 Jul 15 Jul 10 Jul 7 Jul 3 Jun 30 Jun 26 Jun 22 Jun 16

ℹ️ How to read these charts for the fall

As summer ends in Canby, 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 August 27, there's a 20% chance of 32°F — start monitoring forecasts and have plant covers ready
2
Decision time: By September 6, there's a 50% chance of frost — harvest tomatoes, peppers, and other tender crops or prepare protection
3
Last chance: By September 16, 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 16 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 13 Oct 19 Oct 24 Oct 28 Nov 1 Nov 5 Nov 9 Nov 14 Nov 21
First 20° Sep 28 Oct 5 Oct 10 Oct 14 Oct 18 Oct 22 Oct 26 Oct 30 Nov 6
First 24° Sep 20 Sep 25 Sep 28 Oct 1 Oct 4 Oct 6 Oct 9 Oct 12 Oct 17
First 28° Sep 10 Sep 14 Sep 18 Sep 21 Sep 23 Sep 26 Sep 29 Oct 2 Oct 7
First 32° Aug 22 Aug 27 Aug 31 Sep 3 Sep 6 Sep 9 Sep 13 Sep 16 Sep 22
First 36° Aug 6 Aug 12 Aug 16 Aug 19 Aug 22 Aug 25 Aug 29 Sep 1 Sep 7

📍 Frost Dates for other nearby locations

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