🌷 2026 Last Frost Dates for San Bernardino, California 92404
The last 36°F Spring frost date is 30% likely to be on Jun 2. (See detailed probabilities below.)
The last 32°F light freeze date is 30% likely to be on May 18. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for San Bernardino, CA are based on historical climate data.
Always check your local forecast for the most up-to-date frost warnings.
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What is a Last Frost Date?
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!
How to use the Last Frost Date?
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.
Last Frost Date Probabilities
| Probability of frost (36°F) on or after… | |
|---|---|
| 10% chance | Jun 10 |
| 20% chance | Jun 4 |
| 30% chance | Jun 2 |
| 40% chance | May 31 |
| 50% chance | May 27 |
| 60% chance | May 23 |
| 70% chance | May 18 |
| 80% chance | May 12 |
| 90% chance | May 3 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | May 31 |
| 20% chance | May 25 |
| 30% chance | May 18 |
| 40% chance | May 11 |
| 50% chance | May 5 |
| 60% chance | Apr 30 |
| 70% chance | Apr 26 |
| 80% chance | Apr 19 |
| 90% chance | Apr 9 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | May 12 |
| 20% chance | May 1 |
| 30% chance | Apr 24 |
| 40% chance | Apr 17 |
| 50% chance | Apr 11 |
| 60% chance | Apr 6 |
| 70% chance | Mar 31 |
| 80% chance | Mar 24 |
| 90% chance | Mar 14 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Apr 10 |
| 20% chance | Apr 3 |
| 30% chance | Mar 29 |
| 40% chance | Mar 21 |
| 50% chance | Mar 16 |
| 60% chance | Mar 9 |
| 70% chance | Mar 2 |
| 80% chance | Feb 25 |
| 90% chance | Feb 10 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Mar 23 |
| 20% chance | Mar 10 |
| 30% chance | Feb 28 |
| 40% chance | Feb 22 |
| 50% chance | Feb 11 |
| 60% chance | Feb 2 |
| 70% chance | Jan 25 |
| 80% chance | Jan 13 |
| 90% chance | Dec 31 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Feb 28 |
| 20% chance | Feb 12 |
| 30% chance | Feb 1 |
| 40% chance | Jan 21 |
| 50% chance | Jan 12 |
| 60% chance | Jan 6 |
| 70% chance | Jan 1 |
| 80% chance | Dec 25 |
| 90% chance | Dec 14 |
Agricultural climatic data from weather station: LAKE ARROWHEAD (USC00044671:frost)