Frost dates for 95979Stonyford, CA
The average last spring frost in Stonyford is April 6 and the average first fall frost is November 10, giving a typical growing season of about 219 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 6
- Average first fall frost
- Nov 10
- Growing season
- 219 days
Safer after Apr 25 (1-in-10 risk)
Possible by Oct 27 (1-in-10 risk)
First frost typically in 8 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 11 · Apr 25 · May 14 | Oct 13 · Nov 1 · Nov 12 | 188 days | 100% |
| Frost / freeze (32°F) | Mar 6 · Apr 6 · Apr 25 | Oct 27 · Nov 10 · Nov 23 | 219 days | 100% |
| Hard freeze (28°F) | Feb 5 · Mar 2 · Apr 11 | Nov 8 · Nov 24 · Dec 12 | 267 days | 100% |
Planting calendar for Stonyford
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 6 – May 12 |
| Tomatoes | Transplant outdoors | Apr 22 – Jul 21 |
| Peppers | Start seeds indoors | Mar 6 – Apr 6 |
| Peppers | Transplant outdoors | May 6 – Jun 6 |
| Eggplant | Start seeds indoors | Mar 23 – Apr 21 |
| Eggplant | Transplant outdoors | May 6 – Jun 6 |
| Cucumbers | Sow outdoors | May 6 – Jul 31 |
| Summer squash | Sow outdoors | Apr 22 – Jun 6 |
| Winter squash & pumpkins | Sow outdoors | May 6 – Jun 6 |
| Snap beans | Sow outdoors | Apr 22 – Aug 23 |
| Sweet corn | Sow outdoors | Apr 22 – Jul 21 |
| Watermelon & cantaloupe | Sow outdoors | May 6 – Jun 6 |
| Okra | Sow outdoors | Apr 29 – May 22 |
| Peas | Sow outdoors (spring) | Mar 6 – Apr 21 |
| Potatoes | Plant outdoors (spring) | Mar 6 – May 6 |
| Onions | Start seeds indoors (spring) | Jan 23 – Feb 19 |
| Onions | Transplant outdoors (spring) | Mar 23 – Apr 21 |
| Broccoli | Start seeds indoors (spring) | Feb 16 – Mar 22 |
| Broccoli | Transplant outdoors (spring) | Mar 23 – Apr 21 |
| Broccoli | Start seeds indoors (fall) | Jul 11 – Jul 21 |
| Broccoli | Transplant outdoors (fall) | Aug 10 – Aug 21 |
| Cabbage | Start seeds indoors (spring) | Feb 6 – Mar 6 |
| Cabbage | Transplant outdoors (spring) | Mar 6 – Apr 6 |
| Cabbage | Start seeds indoors (fall) | Jul 1 – Jul 31 |
| Cabbage | Transplant outdoors (fall) | Jul 31 – Aug 31 |
| Leaf lettuce | Sow outdoors (spring) | Mar 6 – May 22 |
| Leaf lettuce | Sow outdoors (fall) | Jul 31 – Sep 16 |
| Spinach | Sow outdoors (spring) | Feb 27 – Apr 12 |
| Spinach | Sow outdoors (fall) | Aug 17 – Sep 21 |
| Radishes | Sow outdoors (spring) | Mar 6 – Apr 26 |
| Radishes | Sow outdoors (fall) | Jul 31 – Oct 1 |
| Kale | Sow outdoors (spring) | Mar 23 – Apr 12 |
| Kale | Sow outdoors (fall) | Jul 24 – Aug 31 |
| Carrots | Sow outdoors (spring) | Apr 6 – May 22 |
| Carrots | Sow outdoors (fall) | Jul 1 – Aug 16 |
| Garlic | Plant outdoors (fall) | Oct 31 – Dec 1 |
Where these dates come from
ZIP code 95979 is matched to the NOAA station East Park Rsvr, CA, 5 km away, at 1,205 ft elevation (199 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| East Park Rsvr, CA (used) | 1,205 ft | Apr 6 | Nov 10 |
| Stony Gorge Rsvr, CA | 800 ft | Apr 5 | Nov 13 |
| Willows 6 W, CA | 234 ft | Feb 21 | Dec 6 |
| Clearlake 4 Se, CA | 1,349 ft | Apr 10 | Nov 6 |
Frost dates near Stonyford
- Elk Creek, CA 95939 · last Apr 5, first Nov 13
- Clearlake Oaks, CA 95423 · last Apr 10, first Nov 6
- Maxwell, CA 95955 · last Feb 14, first Dec 1
- Nice, CA 95464 · last Apr 10, first Nov 6
- Lucerne, CA 95458 · last Apr 10, first Nov 6
- Willows, CA 95988 · last Feb 21, first Dec 6
- Williams, CA 95987 · last Feb 14, first Dec 1
- Upper Lake, CA 95485 · last Apr 8, first Nov 6
Frequently asked questions
- When is the last frost in Stonyford, CA?
- For ZIP code 95979, the average last spring frost (32°F) is April 6, based on NOAA 1991-2020 climate normals for the East Park Rsvr, CA weather station. There is a 1-in-10 chance of a frost after April 25.
- When is the first frost in Stonyford, CA?
- The average first fall frost (32°F) is November 10. There is a 1-in-10 chance of frost by October 27, so tender plants are at risk from that point on.
- How long is the growing season in 95979?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 219 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.