Frost dates for 95570Trinidad, CA
The average last spring frost in Trinidad is March 8 and the average first fall frost is November 30, giving a typical growing season of about 262 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 8
- Average first fall frost
- Nov 30
- Growing season
- 262 days
Safer after Apr 15 (1-in-10 risk)
Possible by Nov 1 (1-in-10 risk)
First frost typically in 34 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 28 · Apr 24 · May 15 | Oct 11 · Nov 1 · Nov 24 | 190 days | 100% |
| Frost / freeze (32°F) | Jan 13 · Mar 8 · Apr 15 | Nov 1 · Nov 30 · Jan 4 | 262 days | 99% |
| Hard freeze (28°F) | Dec 14 · Jan 20 · Feb 26 | Nov 30 · Dec 24 · Feb 8 | 345 days | 67% |
Planting calendar for Trinidad
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 5 – Apr 13 |
| Tomatoes | Transplant outdoors | Mar 24 – Aug 10 |
| Peppers | Start seeds indoors | Feb 5 – Mar 8 |
| Peppers | Transplant outdoors | Apr 7 – May 8 |
| Eggplant | Start seeds indoors | Feb 22 – Mar 23 |
| Eggplant | Transplant outdoors | Apr 7 – May 8 |
| Cucumbers | Sow outdoors | Apr 7 – Aug 20 |
| Summer squash | Sow outdoors | Mar 24 – May 8 |
| Winter squash & pumpkins | Sow outdoors | Apr 7 – May 8 |
| Snap beans | Sow outdoors | Mar 24 – Sep 12 |
| Sweet corn | Sow outdoors | Mar 24 – Aug 10 |
| Watermelon & cantaloupe | Sow outdoors | Apr 7 – May 8 |
| Okra | Sow outdoors | Mar 31 – Apr 23 |
| Peas | Sow outdoors (spring) | Feb 5 – Mar 23 |
| Potatoes | Plant outdoors (spring) | Feb 5 – Apr 7 |
| Onions | Start seeds indoors (spring) | Dec 25 – Jan 21 |
| Onions | Transplant outdoors (spring) | Feb 22 – Mar 23 |
| Broccoli | Start seeds indoors (spring) | Jan 18 – Feb 21 |
| Broccoli | Transplant outdoors (spring) | Feb 22 – Mar 23 |
| Broccoli | Start seeds indoors (fall) | Jul 31 – Aug 10 |
| Broccoli | Transplant outdoors (fall) | Aug 30 – Sep 10 |
| Cabbage | Start seeds indoors (spring) | Jan 8 – Feb 5 |
| Cabbage | Transplant outdoors (spring) | Feb 5 – Mar 8 |
| Cabbage | Start seeds indoors (fall) | Jul 21 – Aug 20 |
| Cabbage | Transplant outdoors (fall) | Aug 20 – Sep 20 |
| Leaf lettuce | Sow outdoors (spring) | Feb 5 – Apr 23 |
| Leaf lettuce | Sow outdoors (fall) | Aug 20 – Oct 6 |
| Spinach | Sow outdoors (spring) | Jan 29 – Mar 14 |
| Spinach | Sow outdoors (fall) | Sep 6 – Oct 11 |
| Radishes | Sow outdoors (spring) | Feb 5 – Mar 28 |
| Radishes | Sow outdoors (fall) | Aug 20 – Oct 21 |
| Kale | Sow outdoors (spring) | Feb 22 – Mar 14 |
| Kale | Sow outdoors (fall) | Aug 13 – Sep 20 |
| Carrots | Sow outdoors (spring) | Mar 8 – Apr 23 |
| Carrots | Sow outdoors (fall) | Jul 21 – Sep 5 |
| Garlic | Plant outdoors (fall) | Nov 20 – Dec 21 |
Where these dates come from
ZIP code 95570 is matched to the NOAA station Arcata Eureka Ap, CA, 9.5 km away, at 200 ft elevation (30 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Arcata Eureka Ap, CA (used) | 200 ft | Mar 8 | Nov 30 |
| Eureka Wfo Woodley Island, CA | 20 ft | Feb 22 | Dec 7 |
| Orick Prairie Creek Park, CA | 160 ft | Apr 12 | Nov 6 |
| Klamath, CA | 28 ft | Mar 16 | Nov 20 |
Frost dates near Trinidad
- Mckinleyville, CA 95519 · last Mar 8, first Nov 30
- Arcata, CA 95521 · last Feb 22, first Dec 7
- Blue Lake, CA 95525 · last Mar 8, first Nov 30
- Bayside, CA 95524 · last Feb 22, first Dec 7
- Samoa, CA 95564 · last Feb 22, first Dec 7
- Eureka, CA 95502 · last Feb 22, first Dec 7
- Cutten, CA 95534 · last Feb 22, first Dec 7
- Orick, CA 95555 · last Apr 12, first Nov 6
Frequently asked questions
- When is the last frost in Trinidad, CA?
- For ZIP code 95570, the average last spring frost (32°F) is March 8, based on NOAA 1991-2020 climate normals for the Arcata Eureka Ap, CA weather station. There is a 1-in-10 chance of a frost after April 15.
- When is the first frost in Trinidad, CA?
- The average first fall frost (32°F) is November 30. There is a 1-in-10 chance of frost by November 1, so tender plants are at risk from that point on.
- How long is the growing season in 95570?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 262 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.