Frost dates for 12520Cornwall On Hudson, NY
The average last spring frost in Cornwall On Hudson is April 10 and the average first fall frost is November 1, giving a typical growing season of about 204 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 10
- Average first fall frost
- Nov 1
- Growing season
- 204 days
Safer after Apr 24 (1-in-10 risk)
Possible by Oct 16 (1-in-10 risk)
Last frost typically in 158 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 10 · Apr 23 · May 7 | Oct 7 · Oct 20 · Nov 3 | 179 days | 100% |
| Frost / freeze (32°F) | Mar 31 · Apr 10 · Apr 24 | Oct 16 · Nov 1 · Nov 14 | 204 days | 100% |
| Hard freeze (28°F) | Mar 19 · Apr 2 · Apr 14 | Oct 29 · Nov 12 · Nov 27 | 223 days | 100% |
Planting calendar for Cornwall On Hudson
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 10 – May 16 |
| Tomatoes | Transplant outdoors | Apr 26 – Jul 12 |
| Peppers | Start seeds indoors | Mar 10 – Apr 10 |
| Peppers | Transplant outdoors | May 10 – Jun 10 |
| Eggplant | Start seeds indoors | Mar 27 – Apr 25 |
| Eggplant | Transplant outdoors | May 10 – Jun 10 |
| Cucumbers | Sow outdoors | May 10 – Jul 22 |
| Summer squash | Sow outdoors | Apr 26 – Jun 10 |
| Winter squash & pumpkins | Sow outdoors | May 10 – Jun 10 |
| Snap beans | Sow outdoors | Apr 26 – Aug 14 |
| Sweet corn | Sow outdoors | Apr 26 – Jul 12 |
| Watermelon & cantaloupe | Sow outdoors | May 10 – Jun 10 |
| Okra | Sow outdoors | May 3 – May 26 |
| Peas | Sow outdoors (spring) | Mar 10 – Apr 25 |
| Potatoes | Plant outdoors (spring) | Mar 10 – May 10 |
| Onions | Start seeds indoors (spring) | Jan 27 – Feb 23 |
| Onions | Transplant outdoors (spring) | Mar 27 – Apr 25 |
| Broccoli | Start seeds indoors (spring) | Feb 20 – Mar 26 |
| Broccoli | Transplant outdoors (spring) | Mar 27 – Apr 25 |
| Broccoli | Start seeds indoors (fall) | Jul 2 – Jul 12 |
| Broccoli | Transplant outdoors (fall) | Aug 1 – Aug 12 |
| Cabbage | Start seeds indoors (spring) | Feb 10 – Mar 10 |
| Cabbage | Transplant outdoors (spring) | Mar 10 – Apr 10 |
| Cabbage | Start seeds indoors (fall) | Jun 22 – Jul 22 |
| Cabbage | Transplant outdoors (fall) | Jul 22 – Aug 22 |
| Leaf lettuce | Sow outdoors (spring) | Mar 10 – May 26 |
| Leaf lettuce | Sow outdoors (fall) | Jul 22 – Sep 7 |
| Spinach | Sow outdoors (spring) | Mar 3 – Apr 16 |
| Spinach | Sow outdoors (fall) | Aug 8 – Sep 12 |
| Radishes | Sow outdoors (spring) | Mar 10 – Apr 30 |
| Radishes | Sow outdoors (fall) | Jul 22 – Sep 22 |
| Kale | Sow outdoors (spring) | Mar 27 – Apr 16 |
| Kale | Sow outdoors (fall) | Jul 15 – Aug 22 |
| Carrots | Sow outdoors (spring) | Apr 10 – May 26 |
| Carrots | Sow outdoors (fall) | Jun 22 – Aug 7 |
| Garlic | Plant outdoors (fall) | Oct 22 – Nov 22 |
Where these dates come from
ZIP code 12520 is matched to the NOAA station West Point, NY, 6 km away, at 320 ft elevation (353 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| West Point, NY (used) | 320 ft | Apr 10 | Nov 1 |
| Shrub Oak, NY | 462 ft | Apr 30 | Oct 17 |
| Walden 1 Ese, NY | 380 ft | Apr 29 | Oct 11 |
| Montgomery Orange Ap, NY | 365 ft | May 1 | Oct 11 |
Frost dates near Cornwall On Hudson
- Cornwall, NY 12518 · last Apr 10, first Nov 1
- West Point, NY 10996 · last Apr 10, first Nov 1
- Vails Gate, NY 12584 · last Apr 10, first Nov 1
- New Windsor, NY 12553 · last Apr 29, first Oct 11
- Cold Spring, NY 10516 · last Apr 10, first Nov 1
- Mountainville, NY 10953 · last Apr 10, first Nov 1
- Newburgh, NY 12551 · last Apr 30, first Oct 14
- Highland Falls, NY 10928 · last Apr 10, first Nov 1
Frequently asked questions
- When is the last frost in Cornwall On Hudson, NY?
- For ZIP code 12520, the average last spring frost (32°F) is April 10, based on NOAA 1991-2020 climate normals for the West Point, NY weather station. There is a 1-in-10 chance of a frost after April 24.
- When is the first frost in Cornwall On Hudson, NY?
- The average first fall frost (32°F) is November 1. There is a 1-in-10 chance of frost by October 16, so tender plants are at risk from that point on.
- How long is the growing season in 12520?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 204 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.