When to plant in Mamaroneck, NY
USDA Zone 7bMamaroneck, New York frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 7b means many perennials and even some tender shrubs overwinter in Mamaroneck, while your frost dates still decide when annuals go out.
The average first fall frost in Mamaroneck is now 5 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
DOBBS FERRY-ARDSLEY · 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 Mamaroneck’s own odds, recorded at DOBBS FERRY-ARDSLEY.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 18 | May 2 | Apr 19 | Oct 1 | Oct 12 | Oct 31 |
| 32°F | May 6 | Apr 20 | Apr 4 | Oct 10 | Oct 26 | Nov 10 |
| 28°F | Apr 20 | Apr 4 | Mar 20 | Oct 23 | Nov 7 | Nov 23 |
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 Mamaroneck, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 15 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.
Mamaroneck planting FAQ
When is the last spring frost in Mamaroneck, NY?
On average, the last spring frost in Mamaroneck is around April 20 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Mamaroneck, NY?
In Mamaroneck, the first 32°F freeze of fall lands around October 26 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Mamaroneck in?
Mamaroneck is in USDA hardiness zone 7b. In zone 7b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Mamaroneck?
There are roughly 189 frost-free days in Mamaroneck (a moderate growing season), running from the average last frost around April 20 to the first fall frost near October 26.
When should I plant tomatoes in Mamaroneck?
In Mamaroneck, start tomato seeds indoors around February 23–March 9, then transplant seedlings outdoors around April 27 once the danger of frost has passed.
Never miss a window in Mamaroneck
An email when it’s time to start seeds, transplant, and sow — timed to Mamaroneck’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Rye · 3 km
- New Rochelle · 5 km
- Eastchester · 7 km
- Scarsdale · 8 km
- Glen Cove · 9 km
- Mount Vernon · 9 km
- Port Chester · 9 km
- Harrison · 10 km
Frost dates recorded at DOBBS FERRY-ARDSLEY, 12 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 Mamaroneck, NY — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00302129. Retrieved from https://blissgarden.com/new-york/mamaroneck.