When to plant in Westfield, MA
USDA Zone 6aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Westfield, Massachusetts — all computed from Westfield's nearest NOAA weather station.
Zone 6a means Westfield sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
WESTFIELD BARNES MUNI 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 Westfield’s own odds, recorded at WESTFIELD BARNES MUNI AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 28 | May 14 | May 1 | Sep 16 | Sep 30 | Oct 11 |
| 32°F | May 17 | May 3 | Apr 20 | Sep 26 | Oct 8 | Oct 25 |
| 28°F | May 5 | Apr 21 | Apr 6 | Oct 6 | Oct 20 | Nov 5 |
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 Westfield, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 23 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.
Westfield planting FAQ
When is the last spring frost in Westfield, MA?
On average, the last spring frost in Westfield is around May 3 (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 Westfield, MA?
In Westfield, the first 32°F freeze of fall lands around October 8 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Westfield in?
Westfield is in USDA hardiness zone 6a. In zone 6a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Westfield?
There are roughly 158 frost-free days in Westfield (a moderate growing season), running from the average last frost around May 3 to the first fall frost near October 8.
When should I plant tomatoes in Westfield?
In Westfield, start tomato seeds indoors around March 8–March 22, then transplant seedlings outdoors around May 10 once the danger of frost has passed.
Never miss a window in Westfield
An email when it’s time to start seeds, transplant, and sow — timed to Westfield’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- West Springfield Town · 9 km
- Agawam Town · 12 km
- Holyoke · 12 km
- Easthampton · 16 km
- Chicopee · 16 km
- Springfield · 18 km
- Longmeadow · 18 km
- Northampton · 22 km
Frost dates recorded at WESTFIELD BARNES MUNI AP, 4 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 Westfield, MA — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00014775. Retrieved from https://blissgarden.com/massachusetts/westfield.