When to plant in Greenwich, CT
USDA Zone 7aEverything below — frost dates, hardiness zone, and what to plant when in Greenwich, Connecticut — is derived from the closest NOAA station with complete climate normals.
In zone 7a, Greenwich 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 Greenwich 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 Greenwich’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 Greenwich, 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.
Greenwich planting FAQ
When is the last spring frost in Greenwich, CT?
On average, the last spring frost in Greenwich is around April 12 (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 Greenwich, CT?
In Greenwich, 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 Greenwich in?
Greenwich 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 Greenwich?
Greenwich 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 Greenwich?
For Greenwich, 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 Greenwich
An email when it’s time to start seeds, transplant, and sow — timed to Greenwich’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Port Chester · 4 km
- Harrison · 8 km
- Stamford · 9 km
- White Plains · 10 km
- Rye · 10 km
- Mamaroneck · 13 km
- Scarsdale · 13 km
- Glen Cove · 16 km
Frost dates recorded at WESTCHESTER CO AP, 8 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 Greenwich, CT — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00094745. Retrieved from https://blissgarden.com/connecticut/greenwich.