When to plant in Dedham, MA
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Dedham, Massachusetts — all computed from Dedham's nearest NOAA weather station.
In zone 6b, Dedham gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
NORWOOD MEM 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 Dedham’s own odds, recorded at NORWOOD MEM AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 24 | May 8 | Apr 25 | Sep 17 | Sep 30 | Oct 12 |
| 32°F | May 11 | Apr 25 | Apr 9 | Sep 28 | Oct 9 | Oct 30 |
| 28°F | Apr 27 | Apr 8 | Mar 26 | Oct 6 | Oct 23 | Nov 9 |
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 Dedham, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 7 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.
Dedham planting FAQ
When is the last spring frost in Dedham, MA?
On average, the last spring frost in Dedham is around April 25 (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 Dedham, MA?
The first fall frost in Dedham typically arrives around October 9 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Dedham in?
Dedham is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Dedham?
Dedham has about 167 frost-free days — a moderate growing season — between the average last spring frost (April 25) and first fall frost (October 9).
When should I plant tomatoes in Dedham?
For Dedham, sow tomatoes indoors about February 28–March 14 and move the seedlings out around May 2, after the last spring frost.
Never miss a window in Dedham
An email when it’s time to start seeds, transplant, and sow — timed to Dedham’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at NORWOOD MEM AP, 6 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 Dedham, MA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00054704. Retrieved from https://blissgarden.com/massachusetts/dedham.