Frost dates for 10535Jefferson Valley, NY
The average last spring frost in Jefferson Valley is April 25 and the average first fall frost is October 19, giving a typical growing season of about 174 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 25
- Average first fall frost
- Oct 19
- Growing season
- 174 days
Safer after May 8 (1-in-10 risk)
Possible by Oct 4 (1-in-10 risk)
Last frost typically in 173 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 25 · May 7 · May 21 | Sep 26 · Oct 7 · Oct 22 | 152 days | 100% |
| Frost / freeze (32°F) | Apr 13 · Apr 25 · May 8 | Oct 4 · Oct 19 · Nov 3 | 174 days | 100% |
| Hard freeze (28°F) | Apr 3 · Apr 13 · Apr 26 | Oct 15 · Nov 1 · Nov 14 | 198 days | 100% |
Planting calendar for Jefferson Valley
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 25 – May 31 |
| Tomatoes | Transplant outdoors | May 11 – Jun 29 |
| Peppers | Start seeds indoors | Mar 25 – Apr 25 |
| Peppers | Transplant outdoors | May 25 – Jun 25 |
| Eggplant | Start seeds indoors | Apr 11 – May 10 |
| Eggplant | Transplant outdoors | May 25 – Jun 25 |
| Cucumbers | Sow outdoors | May 25 – Jul 9 |
| Summer squash | Sow outdoors | May 11 – Jun 25 |
| Winter squash & pumpkins | Sow outdoors | May 25 – Jun 25 |
| Snap beans | Sow outdoors | May 11 – Aug 1 |
| Sweet corn | Sow outdoors | May 11 – Jun 29 |
| Watermelon & cantaloupe | Sow outdoors | May 25 – Jun 25 |
| Okra | Sow outdoors | May 18 – Jun 10 |
| Peas | Sow outdoors (spring) | Mar 25 – May 10 |
| Potatoes | Plant outdoors (spring) | Mar 25 – May 25 |
| Onions | Start seeds indoors (spring) | Feb 11 – Mar 10 |
| Onions | Transplant outdoors (spring) | Apr 11 – May 10 |
| Broccoli | Start seeds indoors (spring) | Mar 7 – Apr 10 |
| Broccoli | Transplant outdoors (spring) | Apr 11 – May 10 |
| Broccoli | Start seeds indoors (fall) | Jun 19 – Jun 29 |
| Broccoli | Transplant outdoors (fall) | Jul 19 – Jul 30 |
| Cabbage | Start seeds indoors (spring) | Feb 25 – Mar 25 |
| Cabbage | Transplant outdoors (spring) | Mar 25 – Apr 25 |
| Cabbage | Start seeds indoors (fall) | Jun 9 – Jul 9 |
| Cabbage | Transplant outdoors (fall) | Jul 9 – Aug 9 |
| Leaf lettuce | Sow outdoors (spring) | Mar 25 – Jun 10 |
| Leaf lettuce | Sow outdoors (fall) | Jul 9 – Aug 25 |
| Spinach | Sow outdoors (spring) | Mar 18 – May 1 |
| Spinach | Sow outdoors (fall) | Jul 26 – Aug 30 |
| Radishes | Sow outdoors (spring) | Mar 25 – May 15 |
| Radishes | Sow outdoors (fall) | Jul 9 – Sep 9 |
| Kale | Sow outdoors (spring) | Apr 11 – May 1 |
| Kale | Sow outdoors (fall) | Jul 2 – Aug 9 |
| Carrots | Sow outdoors (spring) | Apr 25 – Jun 10 |
| Carrots | Sow outdoors (fall) | Jun 9 – Jul 25 |
| Garlic | Plant outdoors (fall) | Oct 9 – Nov 9 |
Where these dates come from
ZIP code 10535 is matched to the NOAA station Yorktown Hts 1W, NY, 8 km away, at 670 ft elevation (63 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Yorktown Hts 1W, NY (used) | 670 ft | Apr 25 | Oct 19 |
| Shrub Oak, NY | 462 ft | Apr 30 | Oct 17 |
| West Point, NY | 320 ft | Apr 10 | Nov 1 |
| Carmel 4N, NY | 680 ft | Apr 28 | Oct 16 |
Frost dates near Jefferson Valley
- Shrub Oak, NY 10588 · last Apr 30, first Oct 17
- Baldwin Place, NY 10505 · last Apr 25, first Oct 19
- Yorktown Heights, NY 10598 · last Apr 25, first Oct 19
- Shenorock, NY 10587 · last Apr 25, first Oct 19
- Granite Springs, NY 10527 · last Apr 25, first Oct 19
- Mahopac Falls, NY 10542 · last Apr 25, first Oct 19
- Mahopac, NY 10541 · last Apr 25, first Oct 19
- Mohegan Lake, NY 10547 · last Apr 25, first Oct 19
Frequently asked questions
- When is the last frost in Jefferson Valley, NY?
- For ZIP code 10535, the average last spring frost (32°F) is April 25, based on NOAA 1991-2020 climate normals for the Yorktown Hts 1W, NY weather station. There is a 1-in-10 chance of a frost after May 8.
- When is the first frost in Jefferson Valley, NY?
- The average first fall frost (32°F) is October 19. There is a 1-in-10 chance of frost by October 4, so tender plants are at risk from that point on.
- How long is the growing season in 10535?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 174 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.