Frost Dates: First and last frost dates for Campo, 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 13, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
- Around June 15, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
- Before May 28, 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° | Jan 26 | Dec 11 | -- | -- | -- | -- | -- | -- | -- |
| Last 20° | Feb 21 | Feb 3 | Jan 21 | Jan 8 | Dec 25 | Dec 4 | -- | -- | -- |
| Last 24° | Apr 10 | Mar 25 | Mar 15 | Mar 5 | Feb 24 | Feb 16 | Feb 6 | Jan 26 | Jan 11 |
| Last 28° | May 8 | Apr 24 | Apr 15 | Apr 7 | Mar 30 | Mar 22 | Mar 14 | Mar 4 | Feb 19 |
| Last 32° | Jun 16 | Jun 6 | May 29 | May 22 | May 16 | May 10 | May 4 | Apr 26 | Apr 16 |
| Last 36° | Jul 13 | Jul 4 | Jun 27 | Jun 21 | Jun 15 | Jun 10 | Jun 4 | May 28 | May 18 |
ℹ️ How to read these charts for the fall
As summer ends in Campo, 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° | Dec 30 | Feb 15 | -- | -- | -- | -- | -- | -- | -- |
| First 20° | Nov 20 | Dec 3 | Dec 13 | Dec 23 | Jan 2 | Jan 15 | -- | -- | -- |
| First 24° | Nov 5 | Nov 14 | Nov 21 | Nov 27 | Dec 2 | Dec 7 | Dec 13 | Dec 20 | Dec 29 |
| First 28° | Oct 20 | Oct 27 | Nov 1 | Nov 5 | Nov 9 | Nov 13 | Nov 18 | Nov 23 | Nov 30 |
| First 32° | Sep 20 | Sep 29 | Oct 5 | Oct 11 | Oct 16 | Oct 22 | Oct 27 | Nov 3 | Nov 12 |
| First 36° | Aug 20 | Aug 31 | Sep 8 | Sep 14 | Sep 21 | Sep 27 | Oct 3 | Oct 11 | Oct 22 |
📍 Frost Dates for other nearby locations
- Cuyamaca, CA 24.0 mi
- Alpine, CA 24.7 mi
- El Capitan Dam, CA 28.7 mi
- La Mesa, CA 39.3 mi
- Borrego Desert Park, CA 39.4 mi
- Chula Vista, CA 43.0 mi
- Henshaw Dam, CA 44.6 mi
- San Diego Wso Ap, CA 49.9 mi
- Palomar Mtn Obsvtry, CA 55.8 mi
- El Centro, CA 62.9 mi
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Data is provided by the NOAA National Centers for Environmental Information.