Frost dates for 13782Hamden, NY
The average last spring frost in Hamden is May 21 and the average first fall frost is October 1, giving a typical growing season of about 132 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 21
- Average first fall frost
- Oct 1
- Growing season
- 132 days
Safer after Jun 5 (1-in-10 risk)
Possible by Sep 20 (1-in-10 risk)
Last frost typically in 199 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 17 · May 31 · Jun 18 | Sep 10 · Sep 22 · Oct 3 | 111 days | 100% |
| Frost / freeze (32°F) | May 2 · May 21 · Jun 5 | Sep 20 · Oct 1 · Oct 14 | 132 days | 100% |
| Hard freeze (28°F) | Apr 23 · May 8 · May 24 | Sep 30 · Oct 12 · Oct 31 | 158 days | 100% |
Planting calendar for Hamden
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 20 – Jun 26 |
| Tomatoes | Transplant outdoors | Jun 6 – Jun 11 |
| Peppers | Start seeds indoors | Apr 20 – May 21 |
| Peppers | Transplant outdoors | Jun 20 – Jul 21 |
| Eggplant | Start seeds indoors | May 7 – Jun 5 |
| Eggplant | Transplant outdoors | Jun 20 – Jul 21 |
| Cucumbers | Sow outdoors | Jun 20 – Jun 21 |
| Summer squash | Sow outdoors | Jun 6 – Jul 21 |
| Winter squash & pumpkins | Sow outdoors | Jun 20 – Jul 21 |
| Snap beans | Sow outdoors | Jun 6 – Jul 14 |
| Sweet corn | Sow outdoors | Jun 6 – Jun 11 |
| Watermelon & cantaloupe | Sow outdoors | Jun 20 – Jul 21 |
| Okra | Sow outdoors | Jun 13 – Jul 6 |
| Peas | Sow outdoors (spring) | Apr 20 – Jun 5 |
| Potatoes | Plant outdoors (spring) | Apr 20 – Jun 20 |
| Onions | Start seeds indoors (spring) | Mar 9 – Apr 5 |
| Onions | Transplant outdoors (spring) | May 7 – Jun 5 |
| Broccoli | Start seeds indoors (spring) | Apr 2 – May 6 |
| Broccoli | Transplant outdoors (spring) | May 7 – Jun 5 |
| Broccoli | Start seeds indoors (fall) | Jun 1 – Jun 11 |
| Broccoli | Transplant outdoors (fall) | Jul 1 – Jul 12 |
| Cabbage | Start seeds indoors (spring) | Mar 23 – Apr 20 |
| Cabbage | Transplant outdoors (spring) | Apr 20 – May 21 |
| Cabbage | Start seeds indoors (fall) | May 22 – Jun 21 |
| Cabbage | Transplant outdoors (fall) | Jun 21 – Jul 22 |
| Leaf lettuce | Sow outdoors (spring) | Apr 20 – Jul 6 |
| Leaf lettuce | Sow outdoors (fall) | Jun 21 – Aug 7 |
| Spinach | Sow outdoors (spring) | Apr 13 – May 27 |
| Spinach | Sow outdoors (fall) | Jul 8 – Aug 12 |
| Radishes | Sow outdoors (spring) | Apr 20 – Jun 10 |
| Radishes | Sow outdoors (fall) | Jun 21 – Aug 22 |
| Kale | Sow outdoors (spring) | May 7 – May 27 |
| Kale | Sow outdoors (fall) | Jun 14 – Jul 22 |
| Carrots | Sow outdoors (spring) | May 21 – Jul 6 |
| Carrots | Sow outdoors (fall) | May 22 – Jul 7 |
| Garlic | Plant outdoors (fall) | Sep 21 – Oct 22 |
Where these dates come from
ZIP code 13782 is matched to the NOAA station Walton 2, NY, 12.1 km away, at 1,480 ft elevation (147 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Walton 2, NY (used) | 1,480 ft | May 21 | Oct 1 |
| Delhi 2 Se, NY | 1,460 ft | May 19 | Oct 1 |
| Downsville Dam, NY | 1,200 ft | May 15 | Oct 3 |
| E Sidney, NY | 1,155 ft | May 11 | Oct 9 |
Frost dates near Hamden
- Downsville, NY 13755 · last May 21, first Oct 1
- Walton, NY 13856 · last May 21, first Oct 1
- Delhi, NY 13753 · last May 19, first Oct 1
- Delancey, NY 13752 · last May 21, first Oct 1
- Andes, NY 13731 · last May 19, first Oct 1
- Treadwell, NY 13846 · last May 19, first Oct 1
- Bovina Center, NY 13740 · last May 19, first Oct 1
- Meridale, NY 13806 · last May 19, first Oct 1
Frequently asked questions
- When is the last frost in Hamden, NY?
- For ZIP code 13782, the average last spring frost (32°F) is May 21, based on NOAA 1991-2020 climate normals for the Walton 2, NY weather station. There is a 1-in-10 chance of a frost after June 5.
- When is the first frost in Hamden, NY?
- The average first fall frost (32°F) is October 1. There is a 1-in-10 chance of frost by September 20, so tender plants are at risk from that point on.
- How long is the growing season in 13782?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 132 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.