Frost dates for 95233Hathaway Pines, CA
The average last spring frost in Hathaway Pines is May 7 and the average first fall frost is October 28, giving a typical growing season of about 169 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 7
- Average first fall frost
- Oct 28
- Growing season
- 169 days
Safer after May 31 (1-in-10 risk)
Possible by Oct 5 (1-in-10 risk)
Last frost typically in 190 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) | May 7 · May 30 · Jun 14 | Sep 24 · Oct 11 · Nov 1 | 136 days | 100% |
| Frost / freeze (32°F) | Apr 18 · May 7 · May 31 | Oct 5 · Oct 28 · Nov 16 | 169 days | 100% |
| Hard freeze (28°F) | Mar 28 · Apr 18 · May 12 | Oct 23 · Nov 14 · Dec 5 | 207 days | 100% |
Planting calendar for Hathaway Pines
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 | Apr 6 – Jun 12 |
| Tomatoes | Transplant outdoors | May 23 – Jul 8 |
| Peppers | Start seeds indoors | Apr 6 – May 7 |
| Peppers | Transplant outdoors | Jun 6 – Jul 7 |
| Eggplant | Start seeds indoors | Apr 23 – May 22 |
| Eggplant | Transplant outdoors | Jun 6 – Jul 7 |
| Cucumbers | Sow outdoors | Jun 6 – Jul 18 |
| Summer squash | Sow outdoors | May 23 – Jul 7 |
| Winter squash & pumpkins | Sow outdoors | Jun 6 – Jul 7 |
| Snap beans | Sow outdoors | May 23 – Aug 10 |
| Sweet corn | Sow outdoors | May 23 – Jul 8 |
| Watermelon & cantaloupe | Sow outdoors | Jun 6 – Jul 7 |
| Okra | Sow outdoors | May 30 – Jun 22 |
| Peas | Sow outdoors (spring) | Apr 6 – May 22 |
| Potatoes | Plant outdoors (spring) | Apr 6 – Jun 6 |
| Onions | Start seeds indoors (spring) | Feb 23 – Mar 22 |
| Onions | Transplant outdoors (spring) | Apr 23 – May 22 |
| Broccoli | Start seeds indoors (spring) | Mar 19 – Apr 22 |
| Broccoli | Transplant outdoors (spring) | Apr 23 – May 22 |
| Broccoli | Start seeds indoors (fall) | Jun 28 – Jul 8 |
| Broccoli | Transplant outdoors (fall) | Jul 28 – Aug 8 |
| Cabbage | Start seeds indoors (spring) | Mar 9 – Apr 6 |
| Cabbage | Transplant outdoors (spring) | Apr 6 – May 7 |
| Cabbage | Start seeds indoors (fall) | Jun 18 – Jul 18 |
| Cabbage | Transplant outdoors (fall) | Jul 18 – Aug 18 |
| Leaf lettuce | Sow outdoors (spring) | Apr 6 – Jun 22 |
| Leaf lettuce | Sow outdoors (fall) | Jul 18 – Sep 3 |
| Spinach | Sow outdoors (spring) | Mar 30 – May 13 |
| Spinach | Sow outdoors (fall) | Aug 4 – Sep 8 |
| Radishes | Sow outdoors (spring) | Apr 6 – May 27 |
| Radishes | Sow outdoors (fall) | Jul 18 – Sep 18 |
| Kale | Sow outdoors (spring) | Apr 23 – May 13 |
| Kale | Sow outdoors (fall) | Jul 11 – Aug 18 |
| Carrots | Sow outdoors (spring) | May 7 – Jun 22 |
| Carrots | Sow outdoors (fall) | Jun 18 – Aug 3 |
| Garlic | Plant outdoors (fall) | Oct 18 – Nov 18 |
Where these dates come from
ZIP code 95233 is matched to the NOAA station Calaveras Big Trees, CA, 10.5 km away, at 4,695 ft elevation (1,368 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Calaveras Big Trees, CA (used) | 4,695 ft | May 7 | Oct 28 |
| New Melones Dam Hq, CA | 960 ft | Feb 20 | Dec 11 |
| Sonora, CA | 1,675 ft | Apr 9 | Nov 9 |
| Groveland 2, CA | 2,800 ft | Apr 22 | Nov 2 |
Frost dates near Hathaway Pines
- Avery, CA 95224 · last May 7, first Oct 28
- Murphys, CA 95247 · last Apr 9, first Nov 9
- Douglas Flat, CA 95229 · last Apr 9, first Nov 9
- Mountain Ranch, CA 95246 · last Apr 9, first Nov 9
- Vallecito, CA 95251 · last Apr 9, first Nov 9
- Arnold, CA 95223 · last May 7, first Oct 28
- Columbia, CA 95310 · last Apr 9, first Nov 9
- Twain Harte, CA 95383 · last Apr 16, first Nov 12
Frequently asked questions
- When is the last frost in Hathaway Pines, CA?
- For ZIP code 95233, the average last spring frost (32°F) is May 7, based on NOAA 1991-2020 climate normals for the Calaveras Big Trees, CA weather station. There is a 1-in-10 chance of a frost after May 31.
- When is the first frost in Hathaway Pines, CA?
- The average first fall frost (32°F) is October 28. There is a 1-in-10 chance of frost by October 5, so tender plants are at risk from that point on.
- How long is the growing season in 95233?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 169 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.