Frost dates for 92070Santa Ysabel, CA
The average last spring frost in Santa Ysabel is April 18 and the average first fall frost is October 26, giving a typical growing season of about 189 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 18
- Average first fall frost
- Oct 26
- Growing season
- 189 days
Safer after May 14 (1-in-10 risk)
Possible by Oct 9 (1-in-10 risk)
Last frost typically in 173 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 24 · May 17 · Jun 25 | Sep 18 · Oct 8 · Oct 25 | 142 days | 100% |
| Frost / freeze (32°F) | Mar 30 · Apr 18 · May 14 | Oct 9 · Oct 26 · Nov 13 | 189 days | 100% |
| Hard freeze (28°F) | Feb 11 · Mar 14 · Apr 13 | Oct 25 · Nov 14 · Dec 2 | 239 days | 100% |
Planting calendar for Santa Ysabel
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 18 – May 24 |
| Tomatoes | Transplant outdoors | May 4 – Jul 6 |
| Peppers | Start seeds indoors | Mar 18 – Apr 18 |
| Peppers | Transplant outdoors | May 18 – Jun 18 |
| Eggplant | Start seeds indoors | Apr 4 – May 3 |
| Eggplant | Transplant outdoors | May 18 – Jun 18 |
| Cucumbers | Sow outdoors | May 18 – Jul 16 |
| Summer squash | Sow outdoors | May 4 – Jun 18 |
| Winter squash & pumpkins | Sow outdoors | May 18 – Jun 18 |
| Snap beans | Sow outdoors | May 4 – Aug 8 |
| Sweet corn | Sow outdoors | May 4 – Jul 6 |
| Watermelon & cantaloupe | Sow outdoors | May 18 – Jun 18 |
| Okra | Sow outdoors | May 11 – Jun 3 |
| Peas | Sow outdoors (spring) | Mar 18 – May 3 |
| Potatoes | Plant outdoors (spring) | Mar 18 – May 18 |
| Onions | Start seeds indoors (spring) | Feb 4 – Mar 3 |
| Onions | Transplant outdoors (spring) | Apr 4 – May 3 |
| Broccoli | Start seeds indoors (spring) | Feb 28 – Apr 3 |
| Broccoli | Transplant outdoors (spring) | Apr 4 – May 3 |
| Broccoli | Start seeds indoors (fall) | Jun 26 – Jul 6 |
| Broccoli | Transplant outdoors (fall) | Jul 26 – Aug 6 |
| Cabbage | Start seeds indoors (spring) | Feb 18 – Mar 18 |
| Cabbage | Transplant outdoors (spring) | Mar 18 – Apr 18 |
| Cabbage | Start seeds indoors (fall) | Jun 16 – Jul 16 |
| Cabbage | Transplant outdoors (fall) | Jul 16 – Aug 16 |
| Leaf lettuce | Sow outdoors (spring) | Mar 18 – Jun 3 |
| Leaf lettuce | Sow outdoors (fall) | Jul 16 – Sep 1 |
| Spinach | Sow outdoors (spring) | Mar 11 – Apr 24 |
| Spinach | Sow outdoors (fall) | Aug 2 – Sep 6 |
| Radishes | Sow outdoors (spring) | Mar 18 – May 8 |
| Radishes | Sow outdoors (fall) | Jul 16 – Sep 16 |
| Kale | Sow outdoors (spring) | Apr 4 – Apr 24 |
| Kale | Sow outdoors (fall) | Jul 9 – Aug 16 |
| Carrots | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Carrots | Sow outdoors (fall) | Jun 16 – Aug 1 |
| Garlic | Plant outdoors (fall) | Oct 16 – Nov 16 |
Where these dates come from
ZIP code 92070 is matched to the NOAA station Henshaw Dam, CA, 11.7 km away, at 2,700 ft elevation (371 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Henshaw Dam, CA (used) | 2,700 ft | Apr 18 | Oct 26 |
| Julian Cdf, CA | 4,215 ft | Mar 27 | Dec 1 |
| Cuyamaca, CA | 4,640 ft | Apr 19 | Oct 27 |
| Ramona Ap, CA | 1,393 ft | Mar 19 | Nov 23 |
Frost dates near Santa Ysabel
- Julian, CA 92036 · last Mar 27, first Dec 1
- San Ysidro, CA 92143 · last Mar 27, first Dec 1
- Ranchita, CA 92066 · last Mar 27, first Dec 1
- Warner Springs, CA 92086 · last Apr 18, first Oct 26
- Ramona, CA 92065 · last Mar 19, first Nov 23
- Palomar Mountain, CA 92060 · last Apr 29, first Nov 18
- Pauma Valley, CA 92061 · last Mar 19, first Nov 23
- Valley Center, CA 92082 · last Feb 19, first Dec 1
Frequently asked questions
- When is the last frost in Santa Ysabel, CA?
- For ZIP code 92070, the average last spring frost (32°F) is April 18, based on NOAA 1991-2020 climate normals for the Henshaw Dam, CA weather station. There is a 1-in-10 chance of a frost after May 14.
- When is the first frost in Santa Ysabel, CA?
- The average first fall frost (32°F) is October 26. There is a 1-in-10 chance of frost by October 9, so tender plants are at risk from that point on.
- How long is the growing season in 92070?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 189 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.