Frost dates for 13797Lisle, NY
The average last spring frost in Lisle is May 13 and the average first fall frost is October 4, giving a typical growing season of about 145 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 13
- Average first fall frost
- Oct 4
- Growing season
- 145 days
Safer after May 29 (1-in-10 risk)
Possible by Sep 23 (1-in-10 risk)
Last frost typically in 191 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 8 · May 25 · Jun 6 | Sep 11 · Sep 24 · Oct 6 | 121 days | 100% |
| Frost / freeze (32°F) | Apr 27 · May 13 · May 29 | Sep 23 · Oct 4 · Oct 23 | 145 days | 100% |
| Hard freeze (28°F) | Apr 15 · Apr 30 · May 17 | Oct 3 · Oct 20 · Nov 4 | 169 days | 100% |
Planting calendar for Lisle
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 12 – Jun 18 |
| Tomatoes | Transplant outdoors | May 29 – Jun 14 |
| Peppers | Start seeds indoors | Apr 12 – May 13 |
| Peppers | Transplant outdoors | Jun 12 – Jul 13 |
| Eggplant | Start seeds indoors | Apr 29 – May 28 |
| Eggplant | Transplant outdoors | Jun 12 – Jul 13 |
| Cucumbers | Sow outdoors | Jun 12 – Jun 24 |
| Summer squash | Sow outdoors | May 29 – Jul 13 |
| Winter squash & pumpkins | Sow outdoors | Jun 12 – Jul 13 |
| Snap beans | Sow outdoors | May 29 – Jul 17 |
| Sweet corn | Sow outdoors | May 29 – Jun 14 |
| Watermelon & cantaloupe | Sow outdoors | Jun 12 – Jul 13 |
| Okra | Sow outdoors | Jun 5 – Jun 28 |
| Peas | Sow outdoors (spring) | Apr 12 – May 28 |
| Potatoes | Plant outdoors (spring) | Apr 12 – Jun 12 |
| Onions | Start seeds indoors (spring) | Mar 1 – Mar 28 |
| Onions | Transplant outdoors (spring) | Apr 29 – May 28 |
| Broccoli | Start seeds indoors (spring) | Mar 25 – Apr 28 |
| Broccoli | Transplant outdoors (spring) | Apr 29 – May 28 |
| Broccoli | Start seeds indoors (fall) | Jun 4 – Jun 14 |
| Broccoli | Transplant outdoors (fall) | Jul 4 – Jul 15 |
| Cabbage | Start seeds indoors (spring) | Mar 15 – Apr 12 |
| Cabbage | Transplant outdoors (spring) | Apr 12 – May 13 |
| Cabbage | Start seeds indoors (fall) | May 25 – Jun 24 |
| Cabbage | Transplant outdoors (fall) | Jun 24 – Jul 25 |
| Leaf lettuce | Sow outdoors (spring) | Apr 12 – Jun 28 |
| Leaf lettuce | Sow outdoors (fall) | Jun 24 – Aug 10 |
| Spinach | Sow outdoors (spring) | Apr 5 – May 19 |
| Spinach | Sow outdoors (fall) | Jul 11 – Aug 15 |
| Radishes | Sow outdoors (spring) | Apr 12 – Jun 2 |
| Radishes | Sow outdoors (fall) | Jun 24 – Aug 25 |
| Kale | Sow outdoors (spring) | Apr 29 – May 19 |
| Kale | Sow outdoors (fall) | Jun 17 – Jul 25 |
| Carrots | Sow outdoors (spring) | May 13 – Jun 28 |
| Carrots | Sow outdoors (fall) | May 25 – Jul 10 |
| Garlic | Plant outdoors (fall) | Sep 24 – Oct 25 |
Where these dates come from
ZIP code 13797 is matched to the NOAA station Ithaca 13 E, NY, 20.9 km away, at 1,228 ft elevation (134 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Ithaca 13 E, NY (used) | 1,228 ft | May 13 | Oct 4 |
| Whitney Pt Dam, NY | 1,040 ft | May 4 | Oct 16 |
| Binghamton, NY | 1,606 ft | May 2 | Oct 11 |
| Endicott, NY | 827 ft | May 5 | Oct 12 |
Frost dates near Lisle
- Whitney Point, NY 13862 · last May 2, first Oct 11
- Killawog, NY 13794 · last May 4, first Oct 16
- Maine, NY 13802 · last May 4, first Oct 16
- Glen Aubrey, NY 13777 · last May 2, first Oct 11
- Marathon, NY 13803 · last May 13, first Oct 4
- Castle Creek, NY 13744 · last May 2, first Oct 11
- Berkshire, NY 13736 · last May 13, first Oct 4
- Richford, NY 13835 · last May 13, first Oct 4
Frequently asked questions
- When is the last frost in Lisle, NY?
- For ZIP code 13797, the average last spring frost (32°F) is May 13, based on NOAA 1991-2020 climate normals for the Ithaca 13 E, NY weather station. There is a 1-in-10 chance of a frost after May 29.
- When is the first frost in Lisle, NY?
- The average first fall frost (32°F) is October 4. There is a 1-in-10 chance of frost by September 23, so tender plants are at risk from that point on.
- How long is the growing season in 13797?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 145 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.