When to plant in Harrison, NY
USDA Zone 7aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Harrison, New York — all computed from Harrison's nearest NOAA weather station.
In zone 7a, Harrison supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
The average last spring frost in Harrison is now 5 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
WESTCHESTER CO AP · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Harrison’s own odds, recorded at WESTCHESTER CO AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 11 | Apr 26 | Apr 13 | Oct 2 | Oct 18 | Nov 2 |
| 32°F | Apr 27 | Apr 12 | Apr 1 | Oct 15 | Oct 31 | Nov 14 |
| 28°F | Apr 13 | Apr 1 | Mar 18 | Oct 29 | Nov 13 | Nov 29 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Harrison, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Harrison planting FAQ
When is the last spring frost in Harrison, NY?
Plan for the last spring frost in Harrison around April 12 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Harrison, NY?
In Harrison, the first 32°F freeze of fall lands around October 31 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Harrison in?
Harrison is in USDA hardiness zone 7a. In zone 7a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Harrison?
Harrison has about 202 frost-free days — a moderate growing season — between the average last spring frost (April 12) and first fall frost (October 31).
When should I plant tomatoes in Harrison?
For Harrison, sow tomatoes indoors about February 15–March 1 and move the seedlings out around April 19, after the last spring frost.
Never miss a window in Harrison
An email when it’s time to start seeds, transplant, and sow — timed to Harrison’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- White Plains · 3 km
- Port Chester · 5 km
- Scarsdale · 6 km
- Greenwich · 8 km
- Rye · 9 km
- Mamaroneck · 10 km
- Eastchester · 10 km
- New Rochelle · 12 km
Frost dates recorded at WESTCHESTER CO AP, 5 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Harrison, NY — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00094745. Retrieved from https://blissgarden.com/new-york/harrison.