The last 36°F Spring frost date is 30% likely to be on May 10. (See detailed probabilities below.)
The last 32°F light freeze date is 30% likely to be on Apr 22. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for Glenhaven, CA are based on historical climate data.
Always check your local forecast for the most up-to-date frost warnings.
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The last spring frost signals when your area is safe from freezing temperatures. Tender plants can now grow outdoors without cold damage! This marks the beginning of the growing season. Last spring frost serves as your essential starting point for planting warm-season crops. It's also time to remove winter protection from your perennials. Enjoy the longer days and warmer weather!
Start seeds indoors several weeks before your last frost date. This gives plants time to reach transplanting size when weather permits. Plan your outdoor planting schedule around your area's average last frost date. Plant some crops before and some after this date to protect against weather changes. Look for spots in your yard where frost stays longer or disappears earlier. Create your own frost map to use all available growing space and extend your season. Keep watching your local weather forecast to catch any surprise late frosts.
| Probability of frost (36°F) on or after… | |
|---|---|
| 10% chance | May 21 |
| 20% chance | May 14 |
| 30% chance | May 10 |
| 40% chance | May 6 |
| 50% chance | May 2 |
| 60% chance | Apr 30 |
| 70% chance | Apr 27 |
| 80% chance | Apr 23 |
| 90% chance | Apr 18 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | May 1 |
| 20% chance | Apr 27 |
| 30% chance | Apr 22 |
| 40% chance | Apr 18 |
| 50% chance | Apr 14 |
| 60% chance | Apr 9 |
| 70% chance | Apr 5 |
| 80% chance | Mar 30 |
| 90% chance | Mar 21 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | Apr 9 |
| 20% chance | Apr 2 |
| 30% chance | Mar 27 |
| 40% chance | Mar 20 |
| 50% chance | Mar 14 |
| 60% chance | Mar 7 |
| 70% chance | Feb 28 |
| 80% chance | Feb 22 |
| 90% chance | Feb 12 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Mar 5 |
| 20% chance | Feb 25 |
| 30% chance | Feb 18 |
| 40% chance | Feb 12 |
| 50% chance | Feb 6 |
| 60% chance | Feb 2 |
| 70% chance | Jan 29 |
| 80% chance | Jan 19 |
| 90% chance | Jan 2 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Feb 13 |
| 20% chance | Feb 4 |
| 30% chance | Jan 30 |
| 40% chance | Jan 24 |
| 50% chance | Jan 16 |
| 60% chance | Jan 9 |
| 70% chance | Jan 1 |
| 80% chance | Dec 26 |
| 90% chance | Dec 15 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Feb 7 |
| 20% chance | Jan 31 |
| 30% chance | Jan 24 |
| 40% chance | Jan 15 |
| 50% chance | Jan 8 |
| 60% chance | Jan 2 |
| 70% chance | Dec 30 |
| 80% chance | Dec 23 |
| 90% chance | Dec 13 |
Agricultural climatic data from weather station: CLEARLAKE 4 SE (USC00041806)