Frost dates for 95423Clearlake Oaks, CA
The average last spring frost in Clearlake Oaks is April 10 and the average first fall frost is November 6, giving a typical growing season of about 209 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 10
- Average first fall frost
- Nov 6
- Growing season
- 209 days
Safer after Apr 30 (1-in-10 risk)
Possible by Oct 24 (1-in-10 risk)
First frost typically in 3 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 14 · Apr 30 · May 16 | Oct 11 · Oct 27 · Nov 7 | 178 days | 100% |
| Frost / freeze (32°F) | Mar 24 · Apr 10 · Apr 30 | Oct 24 · Nov 6 · Nov 20 | 209 days | 100% |
| Hard freeze (28°F) | Feb 12 · Mar 14 · Apr 7 | Nov 4 · Nov 21 · Dec 8 | 250 days | 100% |
Planting calendar for Clearlake Oaks
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 10 – May 16 |
| Tomatoes | Transplant outdoors | Apr 26 – Jul 17 |
| Peppers | Start seeds indoors | Mar 10 – Apr 10 |
| Peppers | Transplant outdoors | May 10 – Jun 10 |
| Eggplant | Start seeds indoors | Mar 27 – Apr 25 |
| Eggplant | Transplant outdoors | May 10 – Jun 10 |
| Cucumbers | Sow outdoors | May 10 – Jul 27 |
| Summer squash | Sow outdoors | Apr 26 – Jun 10 |
| Winter squash & pumpkins | Sow outdoors | May 10 – Jun 10 |
| Snap beans | Sow outdoors | Apr 26 – Aug 19 |
| Sweet corn | Sow outdoors | Apr 26 – Jul 17 |
| Watermelon & cantaloupe | Sow outdoors | May 10 – Jun 10 |
| Okra | Sow outdoors | May 3 – May 26 |
| Peas | Sow outdoors (spring) | Mar 10 – Apr 25 |
| Potatoes | Plant outdoors (spring) | Mar 10 – May 10 |
| Onions | Start seeds indoors (spring) | Jan 27 – Feb 23 |
| Onions | Transplant outdoors (spring) | Mar 27 – Apr 25 |
| Broccoli | Start seeds indoors (spring) | Feb 20 – Mar 26 |
| Broccoli | Transplant outdoors (spring) | Mar 27 – Apr 25 |
| Broccoli | Start seeds indoors (fall) | Jul 7 – Jul 17 |
| Broccoli | Transplant outdoors (fall) | Aug 6 – Aug 17 |
| Cabbage | Start seeds indoors (spring) | Feb 10 – Mar 10 |
| Cabbage | Transplant outdoors (spring) | Mar 10 – Apr 10 |
| Cabbage | Start seeds indoors (fall) | Jun 27 – Jul 27 |
| Cabbage | Transplant outdoors (fall) | Jul 27 – Aug 27 |
| Leaf lettuce | Sow outdoors (spring) | Mar 10 – May 26 |
| Leaf lettuce | Sow outdoors (fall) | Jul 27 – Sep 12 |
| Spinach | Sow outdoors (spring) | Mar 3 – Apr 16 |
| Spinach | Sow outdoors (fall) | Aug 13 – Sep 17 |
| Radishes | Sow outdoors (spring) | Mar 10 – Apr 30 |
| Radishes | Sow outdoors (fall) | Jul 27 – Sep 27 |
| Kale | Sow outdoors (spring) | Mar 27 – Apr 16 |
| Kale | Sow outdoors (fall) | Jul 20 – Aug 27 |
| Carrots | Sow outdoors (spring) | Apr 10 – May 26 |
| Carrots | Sow outdoors (fall) | Jun 27 – Aug 12 |
| Garlic | Plant outdoors (fall) | Oct 27 – Nov 27 |
Where these dates come from
ZIP code 95423 is matched to the NOAA station Clearlake 4 Se, CA, 17.6 km away, at 1,349 ft elevation (4 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Clearlake 4 Se, CA (used) | 1,349 ft | Apr 10 | Nov 6 |
| East Park Rsvr, CA | 1,205 ft | Apr 6 | Nov 10 |
| Cloverdale, CA | 400 ft | Feb 25 | Dec 3 |
| Ukiah Muni Ap, CA | 601 ft | Mar 5 | Nov 21 |
Frost dates near Clearlake Oaks
- Glenhaven, CA 95443 · last Apr 10, first Nov 6
- Clearlake Park, CA 95424 · last Apr 10, first Nov 6
- Lucerne, CA 95458 · last Apr 10, first Nov 6
- Clearlake, CA 95422 · last Apr 10, first Nov 6
- Nice, CA 95464 · last Apr 10, first Nov 6
- Kelseyville, CA 95451 · last Apr 10, first Nov 6
- Finley, CA 95435 · last Apr 10, first Nov 6
- Lower Lake, CA 95457 · last Apr 10, first Nov 6
Frequently asked questions
- When is the last frost in Clearlake Oaks, CA?
- For ZIP code 95423, the average last spring frost (32°F) is April 10, based on NOAA 1991-2020 climate normals for the Clearlake 4 Se, CA weather station. There is a 1-in-10 chance of a frost after April 30.
- When is the first frost in Clearlake Oaks, CA?
- The average first fall frost (32°F) is November 6. There is a 1-in-10 chance of frost by October 24, so tender plants are at risk from that point on.
- How long is the growing season in 95423?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 209 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.