Frost dates for 95466Philo, CA
The average last spring frost in Philo is March 5 and the average first fall frost is November 21, giving a typical growing season of about 259 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 5
- Average first fall frost
- Nov 21
- Growing season
- 259 days
Safer after Apr 7 (1-in-10 risk)
Possible by Nov 2 (1-in-10 risk)
First frost typically in 23 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 18 · Apr 12 · Apr 30 | Oct 14 · Nov 2 · Nov 22 | 204 days | 100% |
| Frost / freeze (32°F) | Jan 29 · Mar 5 · Apr 7 | Nov 2 · Nov 21 · Dec 9 | 259 days | 100% |
| Hard freeze (28°F) | Dec 22 · Jan 27 · Feb 28 | Nov 15 · Dec 5 · Jan 8 | 318 days | 94% |
Planting calendar for Philo
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 | Feb 2 – Apr 10 |
| Tomatoes | Transplant outdoors | Mar 21 – Aug 1 |
| Peppers | Start seeds indoors | Feb 2 – Mar 5 |
| Peppers | Transplant outdoors | Apr 4 – May 5 |
| Eggplant | Start seeds indoors | Feb 19 – Mar 20 |
| Eggplant | Transplant outdoors | Apr 4 – May 5 |
| Cucumbers | Sow outdoors | Apr 4 – Aug 11 |
| Summer squash | Sow outdoors | Mar 21 – May 5 |
| Winter squash & pumpkins | Sow outdoors | Apr 4 – May 5 |
| Snap beans | Sow outdoors | Mar 21 – Sep 3 |
| Sweet corn | Sow outdoors | Mar 21 – Aug 1 |
| Watermelon & cantaloupe | Sow outdoors | Apr 4 – May 5 |
| Okra | Sow outdoors | Mar 28 – Apr 20 |
| Peas | Sow outdoors (spring) | Feb 2 – Mar 20 |
| Potatoes | Plant outdoors (spring) | Feb 2 – Apr 4 |
| Onions | Start seeds indoors (spring) | Dec 22 – Jan 18 |
| Onions | Transplant outdoors (spring) | Feb 19 – Mar 20 |
| Broccoli | Start seeds indoors (spring) | Jan 15 – Feb 18 |
| Broccoli | Transplant outdoors (spring) | Feb 19 – Mar 20 |
| Broccoli | Start seeds indoors (fall) | Jul 22 – Aug 1 |
| Broccoli | Transplant outdoors (fall) | Aug 21 – Sep 1 |
| Cabbage | Start seeds indoors (spring) | Jan 5 – Feb 2 |
| Cabbage | Transplant outdoors (spring) | Feb 2 – Mar 5 |
| Cabbage | Start seeds indoors (fall) | Jul 12 – Aug 11 |
| Cabbage | Transplant outdoors (fall) | Aug 11 – Sep 11 |
| Leaf lettuce | Sow outdoors (spring) | Feb 2 – Apr 20 |
| Leaf lettuce | Sow outdoors (fall) | Aug 11 – Sep 27 |
| Spinach | Sow outdoors (spring) | Jan 26 – Mar 11 |
| Spinach | Sow outdoors (fall) | Aug 28 – Oct 2 |
| Radishes | Sow outdoors (spring) | Feb 2 – Mar 25 |
| Radishes | Sow outdoors (fall) | Aug 11 – Oct 12 |
| Kale | Sow outdoors (spring) | Feb 19 – Mar 11 |
| Kale | Sow outdoors (fall) | Aug 4 – Sep 11 |
| Carrots | Sow outdoors (spring) | Mar 5 – Apr 20 |
| Carrots | Sow outdoors (fall) | Jul 12 – Aug 27 |
| Garlic | Plant outdoors (fall) | Nov 11 – Dec 12 |
Where these dates come from
ZIP code 95466 is matched to the NOAA station Ukiah Muni Ap, CA, 22.1 km away, at 601 ft elevation (276 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Ukiah Muni Ap, CA (used) | 601 ft | Mar 5 | Nov 21 |
| Ukiah, CA | 636 ft | Mar 19 | Nov 20 |
| Willits 1 Ne, CA | 1,353 ft | May 5 | Oct 9 |
| Potter Valley Powerhouse, CA | 1,018 ft | Apr 8 | Nov 6 |
Frost dates near Philo
- Boonville, CA 95415 · last Mar 5, first Nov 21
- Navarro, CA 95463 · last Apr 8, first Nov 6
- Manchester, CA 95459 · last Mar 19, first Nov 20
- Yorkville, CA 95494 · last Mar 5, first Nov 21
- Point Arena, CA 95468 · last Mar 19, first Nov 20
- Ukiah, CA 95482 · last Mar 19, first Nov 20
- Talmage, CA 95481 · last Mar 5, first Nov 21
- Elk, CA 95432 · last Mar 19, first Nov 20
Frequently asked questions
- When is the last frost in Philo, CA?
- For ZIP code 95466, the average last spring frost (32°F) is March 5, based on NOAA 1991-2020 climate normals for the Ukiah Muni Ap, CA weather station. There is a 1-in-10 chance of a frost after April 7.
- When is the first frost in Philo, CA?
- The average first fall frost (32°F) is November 21. There is a 1-in-10 chance of frost by November 2, so tender plants are at risk from that point on.
- How long is the growing season in 95466?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 259 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.