Frost dates for 95449Hopland, CA
The average last spring frost in Hopland is February 25 and the average first fall frost is December 3, giving a typical growing season of about 279 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Feb 25
- Average first fall frost
- Dec 3
- Growing season
- 279 days
Safer after Apr 2 (1-in-10 risk)
Possible by Nov 14 (1-in-10 risk)
First frost typically in 32 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) | Mar 4 · Apr 5 · Apr 27 | Oct 29 · Nov 14 · Dec 2 | 222 days | 100% |
| Frost / freeze (32°F) | Jan 18 · Feb 25 · Apr 2 | Nov 14 · Dec 3 · Dec 25 | 279 days | 100% |
| Hard freeze (28°F) | Dec 20 · Jan 12 · Feb 21 | Nov 27 · Dec 19 · Jan 18 | 341 days | 82% |
Planting calendar for Hopland
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 | Jan 25 – Apr 2 |
| Tomatoes | Transplant outdoors | Mar 13 – Aug 13 |
| Peppers | Start seeds indoors | Jan 25 – Feb 25 |
| Peppers | Transplant outdoors | Mar 27 – Apr 27 |
| Eggplant | Start seeds indoors | Feb 11 – Mar 12 |
| Eggplant | Transplant outdoors | Mar 27 – Apr 27 |
| Cucumbers | Sow outdoors | Mar 27 – Aug 23 |
| Summer squash | Sow outdoors | Mar 13 – Apr 27 |
| Winter squash & pumpkins | Sow outdoors | Mar 27 – Apr 27 |
| Snap beans | Sow outdoors | Mar 13 – Sep 15 |
| Sweet corn | Sow outdoors | Mar 13 – Aug 13 |
| Watermelon & cantaloupe | Sow outdoors | Mar 27 – Apr 27 |
| Okra | Sow outdoors | Mar 20 – Apr 12 |
| Peas | Sow outdoors (spring) | Jan 25 – Mar 12 |
| Potatoes | Plant outdoors (spring) | Jan 25 – Mar 27 |
| Onions | Start seeds indoors (spring) | Dec 14 – Jan 10 |
| Onions | Transplant outdoors (spring) | Feb 11 – Mar 12 |
| Broccoli | Start seeds indoors (spring) | Jan 7 – Feb 10 |
| Broccoli | Transplant outdoors (spring) | Feb 11 – Mar 12 |
| Broccoli | Start seeds indoors (fall) | Aug 3 – Aug 13 |
| Broccoli | Transplant outdoors (fall) | Sep 2 – Sep 13 |
| Cabbage | Start seeds indoors (spring) | Dec 28 – Jan 25 |
| Cabbage | Transplant outdoors (spring) | Jan 25 – Feb 25 |
| Cabbage | Start seeds indoors (fall) | Jul 24 – Aug 23 |
| Cabbage | Transplant outdoors (fall) | Aug 23 – Sep 23 |
| Leaf lettuce | Sow outdoors (spring) | Jan 25 – Apr 12 |
| Leaf lettuce | Sow outdoors (fall) | Aug 23 – Oct 9 |
| Spinach | Sow outdoors (spring) | Jan 18 – Mar 3 |
| Spinach | Sow outdoors (fall) | Sep 9 – Oct 14 |
| Radishes | Sow outdoors (spring) | Jan 25 – Mar 17 |
| Radishes | Sow outdoors (fall) | Aug 23 – Oct 24 |
| Kale | Sow outdoors (spring) | Feb 11 – Mar 3 |
| Kale | Sow outdoors (fall) | Aug 16 – Sep 23 |
| Carrots | Sow outdoors (spring) | Feb 25 – Apr 12 |
| Carrots | Sow outdoors (fall) | Jul 24 – Sep 8 |
| Garlic | Plant outdoors (fall) | Nov 23 – Dec 24 |
Where these dates come from
ZIP code 95449 is matched to the NOAA station Cloverdale, CA, 16.6 km away, at 400 ft elevation (69 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Cloverdale, CA (used) | 400 ft | Feb 25 | Dec 3 |
| Ukiah Muni Ap, CA | 601 ft | Mar 5 | Nov 21 |
| Ukiah, CA | 636 ft | Mar 19 | Nov 20 |
| Healdsburg, CA | 177 ft | Feb 15 | Dec 2 |
Frost dates near Hopland
- Lakeport, CA 95453 · last Apr 10, first Nov 6
- Cloverdale, CA 95425 · last Feb 25, first Dec 3
- Finley, CA 95435 · last Apr 10, first Nov 6
- Yorkville, CA 95494 · last Mar 5, first Nov 21
- Talmage, CA 95481 · last Mar 5, first Nov 21
- Kelseyville, CA 95451 · last Apr 10, first Nov 6
- Ukiah, CA 95482 · last Mar 19, first Nov 20
- Witter Springs, CA 95493 · last Apr 8, first Nov 6
Frequently asked questions
- When is the last frost in Hopland, CA?
- For ZIP code 95449, the average last spring frost (32°F) is February 25, based on NOAA 1991-2020 climate normals for the Cloverdale, CA weather station. There is a 1-in-10 chance of a frost after April 2.
- When is the first frost in Hopland, CA?
- The average first fall frost (32°F) is December 3. There is a 1-in-10 chance of frost by November 14, so tender plants are at risk from that point on.
- How long is the growing season in 95449?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 279 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.