Frost dates for 11791Syosset, NY
The average last spring frost in Syosset is April 6 and the average first fall frost is November 6, giving a typical growing season of about 213 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 6
- Average first fall frost
- Nov 6
- Growing season
- 213 days
Safer after Apr 20 (1-in-10 risk)
Possible by Oct 25 (1-in-10 risk)
First frost typically in 3 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 7 · Apr 19 · May 3 | Oct 12 · Oct 26 · Nov 9 | 189 days | 100% |
| Frost / freeze (32°F) | Mar 26 · Apr 6 · Apr 20 | Oct 25 · Nov 6 · Nov 21 | 213 days | 100% |
| Hard freeze (28°F) | Mar 12 · Mar 27 · Apr 6 | Nov 5 · Nov 19 · Dec 5 | 236 days | 100% |
Planting calendar for Syosset
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 6 – May 12 |
| Tomatoes | Transplant outdoors | Apr 22 – Jul 17 |
| Peppers | Start seeds indoors | Mar 6 – Apr 6 |
| Peppers | Transplant outdoors | May 6 – Jun 6 |
| Eggplant | Start seeds indoors | Mar 23 – Apr 21 |
| Eggplant | Transplant outdoors | May 6 – Jun 6 |
| Cucumbers | Sow outdoors | May 6 – Jul 27 |
| Summer squash | Sow outdoors | Apr 22 – Jun 6 |
| Winter squash & pumpkins | Sow outdoors | May 6 – Jun 6 |
| Snap beans | Sow outdoors | Apr 22 – Aug 19 |
| Sweet corn | Sow outdoors | Apr 22 – Jul 17 |
| Watermelon & cantaloupe | Sow outdoors | May 6 – Jun 6 |
| Okra | Sow outdoors | Apr 29 – May 22 |
| Peas | Sow outdoors (spring) | Mar 6 – Apr 21 |
| Potatoes | Plant outdoors (spring) | Mar 6 – May 6 |
| Onions | Start seeds indoors (spring) | Jan 23 – Feb 19 |
| Onions | Transplant outdoors (spring) | Mar 23 – Apr 21 |
| Broccoli | Start seeds indoors (spring) | Feb 16 – Mar 22 |
| Broccoli | Transplant outdoors (spring) | Mar 23 – Apr 21 |
| Broccoli | Start seeds indoors (fall) | Jul 7 – Jul 17 |
| Broccoli | Transplant outdoors (fall) | Aug 6 – Aug 17 |
| Cabbage | Start seeds indoors (spring) | Feb 6 – Mar 6 |
| Cabbage | Transplant outdoors (spring) | Mar 6 – Apr 6 |
| Cabbage | Start seeds indoors (fall) | Jun 27 – Jul 27 |
| Cabbage | Transplant outdoors (fall) | Jul 27 – Aug 27 |
| Leaf lettuce | Sow outdoors (spring) | Mar 6 – May 22 |
| Leaf lettuce | Sow outdoors (fall) | Jul 27 – Sep 12 |
| Spinach | Sow outdoors (spring) | Feb 27 – Apr 12 |
| Spinach | Sow outdoors (fall) | Aug 13 – Sep 17 |
| Radishes | Sow outdoors (spring) | Mar 6 – Apr 26 |
| Radishes | Sow outdoors (fall) | Jul 27 – Sep 27 |
| Kale | Sow outdoors (spring) | Mar 23 – Apr 12 |
| Kale | Sow outdoors (fall) | Jul 20 – Aug 27 |
| Carrots | Sow outdoors (spring) | Apr 6 – May 22 |
| Carrots | Sow outdoors (fall) | Jun 27 – Aug 12 |
| Garlic | Plant outdoors (fall) | Oct 27 – Nov 27 |
Where these dates come from
ZIP code 11791 is matched to the NOAA station Farmingdale Ap, NY, 11.5 km away, at 81 ft elevation (119 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Farmingdale Ap, NY (used) | 81 ft | Apr 6 | Nov 6 |
| Centerport, NY | 30 ft | Apr 9 | Nov 10 |
| Mineola, NY | 96 ft | Apr 2 | Nov 12 |
| Wantagh Cedar Creek, NY | 10 ft | Apr 3 | Nov 11 |
Frost dates near Syosset
- Syosset, NY 11773 · last Apr 6, first Nov 6
- Woodbury, NY 11797 · last Apr 6, first Nov 6
- Jericho, NY 11753 · last Apr 2, first Nov 12
- Plainview, NY 11803 · last Apr 6, first Nov 6
- East Norwich, NY 11732 · last Apr 2, first Nov 12
- Hicksville, NY 11802 · last Apr 2, first Nov 12
- Oyster Bay, NY 11771 · last Apr 9, first Nov 10
- Old Bethpage, NY 11804 · last Apr 6, first Nov 6
Frequently asked questions
- When is the last frost in Syosset, NY?
- For ZIP code 11791, the average last spring frost (32°F) is April 6, based on NOAA 1991-2020 climate normals for the Farmingdale Ap, NY weather station. There is a 1-in-10 chance of a frost after April 20.
- When is the first frost in Syosset, NY?
- The average first fall frost (32°F) is November 6. There is a 1-in-10 chance of frost by October 25, so tender plants are at risk from that point on.
- How long is the growing season in 11791?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 213 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.