Frost dates for 11940East Moriches, NY
The average last spring frost in East Moriches is April 18 and the average first fall frost is October 28, giving a typical growing season of about 193 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 18
- Average first fall frost
- Oct 28
- Growing season
- 193 days
Safer after May 1 (1-in-10 risk)
Possible by Oct 13 (1-in-10 risk)
Last frost typically in 168 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 18 · Apr 30 · May 15 | Oct 4 · Oct 17 · Nov 1 | 168 days | 100% |
| Frost / freeze (32°F) | Apr 4 · Apr 18 · May 1 | Oct 13 · Oct 28 · Nov 11 | 193 days | 100% |
| Hard freeze (28°F) | Mar 21 · Apr 3 · Apr 17 | Oct 24 · Nov 9 · Nov 25 | 218 days | 100% |
Planting calendar for East Moriches
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 18 – May 24 |
| Tomatoes | Transplant outdoors | May 4 – Jul 8 |
| Peppers | Start seeds indoors | Mar 18 – Apr 18 |
| Peppers | Transplant outdoors | May 18 – Jun 18 |
| Eggplant | Start seeds indoors | Apr 4 – May 3 |
| Eggplant | Transplant outdoors | May 18 – Jun 18 |
| Cucumbers | Sow outdoors | May 18 – Jul 18 |
| Summer squash | Sow outdoors | May 4 – Jun 18 |
| Winter squash & pumpkins | Sow outdoors | May 18 – Jun 18 |
| Snap beans | Sow outdoors | May 4 – Aug 10 |
| Sweet corn | Sow outdoors | May 4 – Jul 8 |
| Watermelon & cantaloupe | Sow outdoors | May 18 – Jun 18 |
| Okra | Sow outdoors | May 11 – Jun 3 |
| Peas | Sow outdoors (spring) | Mar 18 – May 3 |
| Potatoes | Plant outdoors (spring) | Mar 18 – May 18 |
| Onions | Start seeds indoors (spring) | Feb 4 – Mar 3 |
| Onions | Transplant outdoors (spring) | Apr 4 – May 3 |
| Broccoli | Start seeds indoors (spring) | Feb 28 – Apr 3 |
| Broccoli | Transplant outdoors (spring) | Apr 4 – May 3 |
| Broccoli | Start seeds indoors (fall) | Jun 28 – Jul 8 |
| Broccoli | Transplant outdoors (fall) | Jul 28 – Aug 8 |
| Cabbage | Start seeds indoors (spring) | Feb 18 – Mar 18 |
| Cabbage | Transplant outdoors (spring) | Mar 18 – Apr 18 |
| Cabbage | Start seeds indoors (fall) | Jun 18 – Jul 18 |
| Cabbage | Transplant outdoors (fall) | Jul 18 – Aug 18 |
| Leaf lettuce | Sow outdoors (spring) | Mar 18 – Jun 3 |
| Leaf lettuce | Sow outdoors (fall) | Jul 18 – Sep 3 |
| Spinach | Sow outdoors (spring) | Mar 11 – Apr 24 |
| Spinach | Sow outdoors (fall) | Aug 4 – Sep 8 |
| Radishes | Sow outdoors (spring) | Mar 18 – May 8 |
| Radishes | Sow outdoors (fall) | Jul 18 – Sep 18 |
| Kale | Sow outdoors (spring) | Apr 4 – Apr 24 |
| Kale | Sow outdoors (fall) | Jul 11 – Aug 18 |
| Carrots | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Carrots | Sow outdoors (fall) | Jun 18 – Aug 3 |
| Garlic | Plant outdoors (fall) | Oct 18 – Nov 18 |
Where these dates come from
ZIP code 11940 is matched to the NOAA station Shirley Brookhaven Ap, NY, 9.8 km away, at 82 ft elevation (69 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Shirley Brookhaven Ap, NY (used) | 82 ft | Apr 18 | Oct 28 |
| Westhamptn Gabreski Ap, NY | 67 ft | May 7 | Oct 14 |
| Upton Coop - Nwsfo New York, NY | 80 ft | Apr 21 | Oct 24 |
| Baiting Hollow, NY | 70 ft | Apr 24 | Oct 25 |
Frost dates near East Moriches
- Eastport, NY 11941 · last May 7, first Oct 14
- Center Moriches, NY 11934 · last Apr 18, first Oct 28
- Remsenburg, NY 11960 · last May 7, first Oct 14
- Speonk, NY 11972 · last May 7, first Oct 14
- Manorville, NY 11949 · last Apr 18, first Oct 28
- Moriches, NY 11955 · last Apr 18, first Oct 28
- Westhampton, NY 11977 · last May 7, first Oct 14
- Mastic, NY 11950 · last Apr 18, first Oct 28
Frequently asked questions
- When is the last frost in East Moriches, NY?
- For ZIP code 11940, the average last spring frost (32°F) is April 18, based on NOAA 1991-2020 climate normals for the Shirley Brookhaven Ap, NY weather station. There is a 1-in-10 chance of a frost after May 1.
- When is the first frost in East Moriches, NY?
- The average first fall frost (32°F) is October 28. There is a 1-in-10 chance of frost by October 13, so tender plants are at risk from that point on.
- How long is the growing season in 11940?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 193 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.