Frost dates for 96044Hornbrook, CA
The average last spring frost in Hornbrook is May 12 and the average first fall frost is October 8, giving a typical growing season of about 148 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 12
- Average first fall frost
- Oct 8
- Growing season
- 148 days
Safer after Jun 1 (1-in-10 risk)
Possible by Sep 24 (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 15 · May 31 · Jun 17 | Sep 11 · Sep 26 · Oct 9 | 118 days | 100% |
| Frost / freeze (32°F) | Apr 26 · May 12 · Jun 1 | Sep 24 · Oct 8 · Oct 22 | 148 days | 100% |
| Hard freeze (28°F) | Apr 6 · Apr 25 · May 13 | Oct 6 · Oct 22 · Nov 5 | 178 days | 100% |
Planting calendar for Hornbrook
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 11 – Jun 17 |
| Tomatoes | Transplant outdoors | May 28 – Jun 18 |
| Peppers | Start seeds indoors | Apr 11 – May 12 |
| Peppers | Transplant outdoors | Jun 11 – Jul 12 |
| Eggplant | Start seeds indoors | Apr 28 – May 27 |
| Eggplant | Transplant outdoors | Jun 11 – Jul 12 |
| Cucumbers | Sow outdoors | Jun 11 – Jun 28 |
| Summer squash | Sow outdoors | May 28 – Jul 12 |
| Winter squash & pumpkins | Sow outdoors | Jun 11 – Jul 12 |
| Snap beans | Sow outdoors | May 28 – Jul 21 |
| Sweet corn | Sow outdoors | May 28 – Jun 18 |
| Watermelon & cantaloupe | Sow outdoors | Jun 11 – Jul 12 |
| Okra | Sow outdoors | Jun 4 – Jun 27 |
| Peas | Sow outdoors (spring) | Apr 11 – May 27 |
| Potatoes | Plant outdoors (spring) | Apr 11 – Jun 11 |
| Onions | Start seeds indoors (spring) | Feb 28 – Mar 27 |
| Onions | Transplant outdoors (spring) | Apr 28 – May 27 |
| Broccoli | Start seeds indoors (spring) | Mar 24 – Apr 27 |
| Broccoli | Transplant outdoors (spring) | Apr 28 – May 27 |
| Broccoli | Start seeds indoors (fall) | Jun 8 – Jun 18 |
| Broccoli | Transplant outdoors (fall) | Jul 8 – Jul 19 |
| Cabbage | Start seeds indoors (spring) | Mar 14 – Apr 11 |
| Cabbage | Transplant outdoors (spring) | Apr 11 – May 12 |
| Cabbage | Start seeds indoors (fall) | May 29 – Jun 28 |
| Cabbage | Transplant outdoors (fall) | Jun 28 – Jul 29 |
| Leaf lettuce | Sow outdoors (spring) | Apr 11 – Jun 27 |
| Leaf lettuce | Sow outdoors (fall) | Jun 28 – Aug 14 |
| Spinach | Sow outdoors (spring) | Apr 4 – May 18 |
| Spinach | Sow outdoors (fall) | Jul 15 – Aug 19 |
| Radishes | Sow outdoors (spring) | Apr 11 – Jun 1 |
| Radishes | Sow outdoors (fall) | Jun 28 – Aug 29 |
| Kale | Sow outdoors (spring) | Apr 28 – May 18 |
| Kale | Sow outdoors (fall) | Jun 21 – Jul 29 |
| Carrots | Sow outdoors (spring) | May 12 – Jun 27 |
| Carrots | Sow outdoors (fall) | May 29 – Jul 14 |
| Garlic | Plant outdoors (fall) | Sep 28 – Oct 29 |
Where these dates come from
ZIP code 96044 is matched to the NOAA station Montague Siskiyou Co Ap, CA, 14.8 km away, at 2,635 ft elevation (43 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Montague Siskiyou Co Ap, CA (used) | 2,635 ft | May 12 | Oct 8 |
| Copco #1 Dam, CA | 2,703 ft | May 4 | Oct 21 |
| Yreka, CA | 2,709 ft | Apr 30 | Oct 18 |
| Ashland, OR | 1,729 ft | May 6 | Oct 8 |
Frost dates near Hornbrook
- Montague, CA 96064 · last May 12, first Oct 8
- Yreka, CA 96097 · last Apr 30, first Oct 18
- Klamath River, CA 96050 · last May 6, first Oct 8
- Grenada, CA 96038 · last Apr 30, first Oct 18
- Ashland, OR 97520 · last May 6, first Oct 8
- Scott Bar, CA 96085 · last Apr 30, first Oct 18
- Talent, OR 97540 · last May 6, first Oct 8
- Fort Jones, CA 96032 · last Apr 30, first Oct 18
Frequently asked questions
- When is the last frost in Hornbrook, CA?
- For ZIP code 96044, the average last spring frost (32°F) is May 12, based on NOAA 1991-2020 climate normals for the Montague Siskiyou Co Ap, CA weather station. There is a 1-in-10 chance of a frost after June 1.
- When is the first frost in Hornbrook, CA?
- The average first fall frost (32°F) is October 8. There is a 1-in-10 chance of frost by September 24, so tender plants are at risk from that point on.
- How long is the growing season in 96044?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 148 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.