Frost Dates: First and last frost dates for Dobbins, 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 1, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
- Around May 8, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
- Before April 23, 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° | Jan 26 | Jan 10 | Dec 25 | -- | -- | -- | -- | -- | -- |
| Last 24° | Mar 17 | Feb 28 | Feb 15 | Feb 4 | Jan 25 | Jan 14 | Jan 2 | Dec 15 | -- |
| Last 28° | Apr 17 | Apr 1 | Mar 21 | Mar 12 | Mar 3 | Feb 22 | Feb 12 | Feb 1 | Jan 17 |
| Last 32° | May 11 | May 4 | Apr 29 | Apr 24 | Apr 20 | Apr 15 | Apr 11 | Apr 5 | Mar 29 |
| Last 36° | Jun 1 | May 24 | May 18 | May 13 | May 8 | May 3 | Apr 28 | Apr 23 | Apr 15 |
ℹ️ How to read these charts for the fall
As summer ends in Dobbins, 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° | Dec 9 | Dec 27 | Jan 15 | -- | -- | -- | -- | -- | -- |
| First 24° | Nov 12 | Nov 26 | Dec 7 | Dec 15 | Dec 24 | Jan 2 | Jan 12 | Jan 26 | -- |
| First 28° | Nov 3 | Nov 13 | Nov 20 | Nov 25 | Dec 1 | Dec 6 | Dec 12 | Dec 19 | Dec 28 |
| First 32° | Oct 20 | Oct 27 | Nov 2 | Nov 6 | Nov 11 | Nov 15 | Nov 20 | Nov 25 | Dec 3 |
| First 36° | Oct 6 | Oct 12 | Oct 16 | Oct 19 | Oct 22 | Oct 26 | Oct 29 | Nov 2 | Nov 7 |
📍 Frost Dates for other nearby locations
- Strawberry Valley, CA 14.7 mi
- Grass Valley #2, CA 16.1 mi
- Nevada City, CA 17.7 mi
- Oroville, CA 25.0 mi
- Colfax, CA 27.4 mi
- Downieville, CA 30.0 mi
- Marysville, CA 30.2 mi
- Auburn, CA 34.1 mi
- Blue Canyon Nyack Ap, CA 35.8 mi
- Paradise, CA 38.1 mi
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Data is provided by the NOAA National Centers for Environmental Information.