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Will it freeze in Harrison in the next 7 nights?
No overnight lows at or below 32°F are forecast in Harrison during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 60°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
1 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 60°F Above 36°F · Light Rain then Patchy Fog
- Fri, Nov 6 52°F Above 36°F · Light Rain Likely
- Sat, Nov 7 44°F Above 36°F · Slight Chance Light Rain
- Sun, Nov 8 40°F Above 36°F · Mostly Clear
- Mon, Nov 9 39°F Above 36°F · Mostly Clear
- Tue, Nov 10 39°F Above 36°F · Mostly Clear
- Wed, Nov 11 36°F Frost possible · Partly Cloudy
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Harrison
The median first fall hard-freeze date (28°F) is November 13, from NOAA’s 1991–2020 Climate Normals at Westchester County Airport. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | Apr 13 · Apr 26 · May 11 | Oct 2 · Oct 18 · Nov 2 | 174 days |
| 32°F freeze | Apr 1 · Apr 12 · Apr 27 | Oct 15 · Oct 31 · Nov 14 | 200 days |
| 28°F hard freeze | Mar 18 · Apr 1 · Apr 13 | Oct 29 · Nov 13 · Nov 29 | 224 days |
Average high temperature by month
1991–2020 normals at Westchester County Airport
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Harrison, NY come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Westchester County Airport (station USW00094745, elevation 379 ft), 3.0 mi from Harrison. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Harrison
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| White Plains, NY | 1.9 mi | Apr 12 | Oct 31 |
| Rye Brook, NY | 1.9 mi | Apr 12 | Oct 31 |
| Port Chester, NY | 3.1 mi | Apr 12 | Oct 31 |
| Scarsdale, NY | 3.7 mi | Apr 20 | Oct 26 |
| Elmsford, NY | 5.6 mi | Apr 20 | Oct 26 |
| Rye, NY | 5.6 mi | Apr 12 | Oct 31 |
| Mamaroneck, NY | 6.2 mi | Apr 20 | Oct 26 |
| Ardsley, NY | 6.2 mi | Apr 20 | Oct 26 |
| Larchmont, NY | 6.8 mi | Apr 20 | Oct 26 |
| Tuckahoe, NY | 7.5 mi | Apr 20 | Oct 26 |
Frequently asked questions
When is the last frost in Harrison?
On average, the last spring frost (32°F) in Harrison is around April 12. In about 1 year in 10 it comes after April 27, and in 9 years in 10 it comes after April 1.
When is the first frost in Harrison?
The first fall frost (32°F) usually arrives around October 31. There’s a 10% chance of a freeze by October 15 and a 90% chance by November 14.
Can it frost in Harrison after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after April 26.
What growing zone is Harrison?
Harrison is in USDA Plant Hardiness Zone 7a (average annual extreme minimum temperature 0 to 5°F), based on the 2023 USDA map for ZIP code 10577. See growing zones in New York.
More: all New York frost dates · New York growing zones · UV index today in Harrison · frost vs. freeze