Frost dates for 10549Mount Kisco, NY
The average last spring frost in Mount Kisco is April 12 and the average first fall frost is October 31, giving a typical growing season of about 200 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 12
- Average first fall frost
- Oct 31
- Growing season
- 200 days
Safer after Apr 27 (1-in-10 risk)
Possible by Oct 15 (1-in-10 risk)
Last frost typically in 160 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 13 · Apr 26 · May 11 | Oct 2 · Oct 18 · Nov 2 | 174 days | 100% |
| Frost / freeze (32°F) | Apr 1 · Apr 12 · Apr 27 | Oct 15 · Oct 31 · Nov 14 | 200 days | 100% |
| Hard freeze (28°F) | Mar 18 · Apr 1 · Apr 13 | Oct 29 · Nov 13 · Nov 29 | 224 days | 100% |
Planting calendar for Mount Kisco
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 12 – May 18 |
| Tomatoes | Transplant outdoors | Apr 28 – Jul 11 |
| Peppers | Start seeds indoors | Mar 12 – Apr 12 |
| Peppers | Transplant outdoors | May 12 – Jun 12 |
| Eggplant | Start seeds indoors | Mar 29 – Apr 27 |
| Eggplant | Transplant outdoors | May 12 – Jun 12 |
| Cucumbers | Sow outdoors | May 12 – Jul 21 |
| Summer squash | Sow outdoors | Apr 28 – Jun 12 |
| Winter squash & pumpkins | Sow outdoors | May 12 – Jun 12 |
| Snap beans | Sow outdoors | Apr 28 – Aug 13 |
| Sweet corn | Sow outdoors | Apr 28 – Jul 11 |
| Watermelon & cantaloupe | Sow outdoors | May 12 – Jun 12 |
| Okra | Sow outdoors | May 5 – May 28 |
| Peas | Sow outdoors (spring) | Mar 12 – Apr 27 |
| Potatoes | Plant outdoors (spring) | Mar 12 – May 12 |
| Onions | Start seeds indoors (spring) | Jan 29 – Feb 25 |
| Onions | Transplant outdoors (spring) | Mar 29 – Apr 27 |
| Broccoli | Start seeds indoors (spring) | Feb 22 – Mar 28 |
| Broccoli | Transplant outdoors (spring) | Mar 29 – Apr 27 |
| Broccoli | Start seeds indoors (fall) | Jul 1 – Jul 11 |
| Broccoli | Transplant outdoors (fall) | Jul 31 – Aug 11 |
| Cabbage | Start seeds indoors (spring) | Feb 12 – Mar 12 |
| Cabbage | Transplant outdoors (spring) | Mar 12 – Apr 12 |
| Cabbage | Start seeds indoors (fall) | Jun 21 – Jul 21 |
| Cabbage | Transplant outdoors (fall) | Jul 21 – Aug 21 |
| Leaf lettuce | Sow outdoors (spring) | Mar 12 – May 28 |
| Leaf lettuce | Sow outdoors (fall) | Jul 21 – Sep 6 |
| Spinach | Sow outdoors (spring) | Mar 5 – Apr 18 |
| Spinach | Sow outdoors (fall) | Aug 7 – Sep 11 |
| Radishes | Sow outdoors (spring) | Mar 12 – May 2 |
| Radishes | Sow outdoors (fall) | Jul 21 – Sep 21 |
| Kale | Sow outdoors (spring) | Mar 29 – Apr 18 |
| Kale | Sow outdoors (fall) | Jul 14 – Aug 21 |
| Carrots | Sow outdoors (spring) | Apr 12 – May 28 |
| Carrots | Sow outdoors (fall) | Jun 21 – Aug 6 |
| Garlic | Plant outdoors (fall) | Oct 21 – Nov 21 |
Where these dates come from
ZIP code 10549 is matched to the NOAA station Westchester Co Ap, NY, 15.5 km away, at 379 ft elevation (97 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Westchester Co Ap, NY (used) | 379 ft | Apr 12 | Oct 31 |
| Yorktown Hts 1W, NY | 670 ft | Apr 25 | Oct 19 |
| Shrub Oak, NY | 462 ft | Apr 30 | Oct 17 |
| Stamford 5 N, CT | 190 ft | Apr 17 | Oct 23 |
Frost dates near Mount Kisco
- Bedford Hills, NY 10507 · last Apr 12, first Oct 31
- Chappaqua, NY 10514 · last Apr 25, first Oct 19
- Millwood, NY 10546 · last Apr 12, first Oct 31
- Armonk, NY 10504 · last Apr 12, first Oct 31
- Bedford, NY 10506 · last Apr 12, first Oct 31
- Katonah, NY 10536 · last Apr 17, first Oct 23
- Pleasantville, NY 10570 · last Apr 12, first Oct 31
- Maryknoll, NY 10545 · last Apr 12, first Oct 31
Frequently asked questions
- When is the last frost in Mount Kisco, NY?
- For ZIP code 10549, the average last spring frost (32°F) is April 12, based on NOAA 1991-2020 climate normals for the Westchester Co Ap, NY weather station. There is a 1-in-10 chance of a frost after April 27.
- When is the first frost in Mount Kisco, NY?
- The average first fall frost (32°F) is October 31. There is a 1-in-10 chance of frost by October 15, so tender plants are at risk from that point on.
- How long is the growing season in 10549?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 200 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.