Frost Dates: First and last frost dates for Martinez Wtp, 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 April 13, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
- Around March 15, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
- Before February 25, 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° | Jan 22 | Jan 8 | Dec 20 | -- | -- | -- | -- | -- | -- |
| Last 28° | Feb 6 | Jan 25 | Jan 16 | Jan 7 | Dec 29 | Dec 17 | -- | -- | -- |
| Last 32° | Mar 20 | Mar 5 | Feb 22 | Feb 13 | Feb 4 | Jan 27 | Jan 17 | Jan 6 | Dec 19 |
| Last 36° | Apr 13 | Apr 3 | Mar 27 | Mar 21 | Mar 15 | Mar 10 | Mar 4 | Feb 25 | Feb 15 |
ℹ️ How to read these charts for the fall
As summer ends in Martinez Wtp, 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 28 | Jan 18 | -- | -- | -- | -- | -- | -- | -- |
| First 28° | Nov 27 | Dec 7 | Dec 14 | Dec 21 | Dec 29 | Jan 9 | -- | -- | -- |
| First 32° | Nov 6 | Nov 15 | Nov 22 | Nov 27 | Dec 3 | Dec 8 | Dec 14 | Dec 21 | Jan 1 |
| First 36° | Nov 2 | Nov 7 | Nov 11 | Nov 14 | Nov 17 | Nov 20 | Nov 23 | Nov 26 | Dec 1 |
📍 Frost Dates for other nearby locations
- Auberry, CA 22.7 mi
- Balch Pwr House, CA 24.5 mi
- Friant Government Camp, CA 25.1 mi
- Grant Grove, CA 31.6 mi
- North Fork Rs, CA 32.1 mi
- Visalia, CA 32.2 mi
- Huntington Lake, CA 34.0 mi
- Hanford, CA 35.4 mi
- Lemon Cove, CA 38.6 mi
- Three Rvrs Edison Ph, CA 44.2 mi
Or enter a new zipcode:
Data is provided by the NOAA National Centers for Environmental Information.