Frost Dates: First and last frost dates for Ash Mtn, 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 May 8, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
- Around April 9, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
- Before March 21, 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.
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| Last 16° | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Last 20° | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Last 24° | Feb 6 | Jan 8 | Dec 1 | -- | -- | -- | -- | -- | -- |
| Last 28° | Mar 3 | Feb 16 | Feb 4 | Jan 25 | Jan 14 | Jan 2 | Dec 14 | -- | -- |
| Last 32° | Apr 13 | Mar 30 | Mar 21 | Mar 12 | Mar 5 | Feb 25 | Feb 17 | Feb 7 | Jan 25 |
| Last 36° | May 8 | Apr 28 | Apr 21 | Apr 15 | Apr 9 | Apr 3 | Mar 28 | Mar 21 | Mar 11 |
ℹ️ How to read these charts for the fall
As summer ends in Ash Mtn, 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:
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.
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| First 16° | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| First 20° | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| First 24° | Dec 24 | Jan 10 | Feb 2 | -- | -- | -- | -- | -- | -- |
| First 28° | Dec 2 | Dec 12 | Dec 19 | Dec 25 | Jan 1 | Jan 10 | Jan 24 | -- | -- |
| First 32° | Nov 9 | Nov 17 | Nov 22 | Nov 27 | Dec 1 | Dec 5 | Dec 10 | Dec 15 | Dec 22 |
| First 36° | Nov 2 | Nov 8 | Nov 12 | Nov 15 | Nov 18 | Nov 21 | Nov 25 | Nov 28 | Dec 4 |
📍 Frost Dates for other nearby locations
- Three Rvrs Edison Ph, CA 2.9 mi
- Lodgepole, CA 10.3 mi
- Lemon Cove, CA 15.5 mi
- Grant Grove, CA 19.1 mi
- Lindsay, CA 25.3 mi
- Porterville, CA 32.3 mi
- Balch Pwr House, CA 33.6 mi
- Visalia, CA 34.2 mi
- Independence, CA 48.4 mi
- Glennville, CA 54.0 mi
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Data is provided by the NOAA National Centers for Environmental Information.