Frost dates for 95548Klamath, CA
The average last spring frost in Klamath is March 16 and the average first fall frost is November 20, giving a typical growing season of about 252 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 16
- Average first fall frost
- Nov 20
- Growing season
- 252 days
Safer after Apr 20 (1-in-10 risk)
Possible by Oct 30 (1-in-10 risk)
First frost typically in 17 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 22 · Apr 21 · Jun 19 | Oct 11 · Nov 2 · Nov 23 | 194 days | 100% |
| Frost / freeze (32°F) | Feb 8 · Mar 16 · Apr 20 | Oct 30 · Nov 20 · Dec 18 | 252 days | 100% |
| Hard freeze (28°F) | Dec 12 · Feb 4 · Mar 15 | Nov 13 · Dec 11 · Feb 2 | 319 days | 88% |
Planting calendar for Klamath
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 13 – Apr 21 |
| Tomatoes | Transplant outdoors | Apr 1 – Jul 31 |
| Peppers | Start seeds indoors | Feb 13 – Mar 16 |
| Peppers | Transplant outdoors | Apr 15 – May 16 |
| Eggplant | Start seeds indoors | Mar 2 – Mar 31 |
| Eggplant | Transplant outdoors | Apr 15 – May 16 |
| Cucumbers | Sow outdoors | Apr 15 – Aug 10 |
| Summer squash | Sow outdoors | Apr 1 – May 16 |
| Winter squash & pumpkins | Sow outdoors | Apr 15 – May 16 |
| Snap beans | Sow outdoors | Apr 1 – Sep 2 |
| Sweet corn | Sow outdoors | Apr 1 – Jul 31 |
| Watermelon & cantaloupe | Sow outdoors | Apr 15 – May 16 |
| Okra | Sow outdoors | Apr 8 – May 1 |
| Peas | Sow outdoors (spring) | Feb 13 – Mar 31 |
| Potatoes | Plant outdoors (spring) | Feb 13 – Apr 15 |
| Onions | Start seeds indoors (spring) | Jan 2 – Jan 29 |
| Onions | Transplant outdoors (spring) | Mar 2 – Mar 31 |
| Broccoli | Start seeds indoors (spring) | Jan 26 – Mar 1 |
| Broccoli | Transplant outdoors (spring) | Mar 2 – Mar 31 |
| Broccoli | Start seeds indoors (fall) | Jul 21 – Jul 31 |
| Broccoli | Transplant outdoors (fall) | Aug 20 – Aug 31 |
| Cabbage | Start seeds indoors (spring) | Jan 16 – Feb 13 |
| Cabbage | Transplant outdoors (spring) | Feb 13 – Mar 16 |
| Cabbage | Start seeds indoors (fall) | Jul 11 – Aug 10 |
| Cabbage | Transplant outdoors (fall) | Aug 10 – Sep 10 |
| Leaf lettuce | Sow outdoors (spring) | Feb 13 – May 1 |
| Leaf lettuce | Sow outdoors (fall) | Aug 10 – Sep 26 |
| Spinach | Sow outdoors (spring) | Feb 6 – Mar 22 |
| Spinach | Sow outdoors (fall) | Aug 27 – Oct 1 |
| Radishes | Sow outdoors (spring) | Feb 13 – Apr 5 |
| Radishes | Sow outdoors (fall) | Aug 10 – Oct 11 |
| Kale | Sow outdoors (spring) | Mar 2 – Mar 22 |
| Kale | Sow outdoors (fall) | Aug 3 – Sep 10 |
| Carrots | Sow outdoors (spring) | Mar 16 – May 1 |
| Carrots | Sow outdoors (fall) | Jul 11 – Aug 26 |
| Garlic | Plant outdoors (fall) | Nov 10 – Dec 11 |
Where these dates come from
ZIP code 95548 is matched to the NOAA station Klamath, CA, 3 km away, at 28 ft elevation (182 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Klamath, CA (used) | 28 ft | Mar 16 | Nov 20 |
| Orick Prairie Creek Park, CA | 160 ft | Apr 12 | Nov 6 |
| Crescent City Mcnamara Ap, CA | 56 ft | Jan 30 | Dec 25 |
| Crescent City 3 Nnw, CA | 43 ft | Mar 11 | Nov 23 |
Frost dates near Klamath
- Crescent City, CA 95532 · last Mar 11, first Nov 23
- Orick, CA 95555 · last Apr 12, first Nov 6
- Fort Dick, CA 95538 · last Mar 11, first Nov 23
- Gasquet, CA 95543 · last May 1, first Oct 12
- Smith River, CA 95567 · last Jan 31, first Dec 27
- Somes Bar, CA 95568 · last Apr 27, first Oct 21
- Orleans, CA 95556 · last Mar 12, first Nov 26
- Brookings, OR 97415 · last Jan 31, first Dec 27
Frequently asked questions
- When is the last frost in Klamath, CA?
- For ZIP code 95548, the average last spring frost (32°F) is March 16, based on NOAA 1991-2020 climate normals for the Klamath, CA weather station. There is a 1-in-10 chance of a frost after April 20.
- When is the first frost in Klamath, CA?
- The average first fall frost (32°F) is November 20. There is a 1-in-10 chance of frost by October 30, so tender plants are at risk from that point on.
- How long is the growing season in 95548?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 252 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.