When to plant in Norwalk, CT
USDA Zone 7aEverything below — frost dates, hardiness zone, and what to plant when in Norwalk, Connecticut — is derived from the closest NOAA station with complete climate normals.
Zone 7a means many perennials and even some tender shrubs overwinter in Norwalk, while your frost dates still decide when annuals go out.
The average last spring frost in Norwalk is now 7 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
STAMFORD 5 N · 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 Norwalk’s own odds, recorded at STAMFORD 5 N.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 16 | Apr 30 | Apr 16 | Oct 1 | Oct 12 | Oct 25 |
| 32°F | May 2 | Apr 17 | Apr 3 | Oct 8 | Oct 23 | Nov 6 |
| 28°F | Apr 19 | Apr 3 | Mar 20 | Oct 18 | Nov 2 | Nov 19 |
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 Norwalk, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 24 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.
Norwalk planting FAQ
When is the last spring frost in Norwalk, CT?
Plan for the last spring frost in Norwalk around April 17 (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 Norwalk, CT?
The first fall frost in Norwalk typically arrives around October 23 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Norwalk in?
Norwalk 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 Norwalk?
There are roughly 189 frost-free days in Norwalk (a moderate growing season), running from the average last frost around April 17 to the first fall frost near October 23.
When should I plant tomatoes in Norwalk?
In Norwalk, start tomato seeds indoors around February 20–March 6, then transplant seedlings outdoors around April 24 once the danger of frost has passed.
Never miss a window in Norwalk
An email when it’s time to start seeds, transplant, and sow — timed to Norwalk’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Stamford · 11 km
- Greenwich · 19 km
- Bridgeport · 22 km
- Fort Salonga · 23 km
- Port Chester · 23 km
- Huntington · 24 km
- East Northport · 25 km
- Trumbull Center · 26 km
Frost dates recorded at STAMFORD 5 N, 11 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 Norwalk, CT — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00067970. Retrieved from https://blissgarden.com/connecticut/norwalk.