When to plant in Milton, MA
USDA Zone 6bMilton, Massachusetts frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 6b, Milton gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
BLUE HILL COOP · 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 Milton’s own odds, recorded at BLUE HILL COOP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 12 | Apr 30 | Apr 18 | Oct 2 | Oct 14 | Oct 29 |
| 32°F | Apr 30 | Apr 18 | Apr 7 | Oct 9 | Oct 26 | Nov 8 |
| 28°F | Apr 18 | Apr 6 | Mar 28 | Oct 23 | Nov 5 | 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 Milton, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 8 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.
Milton planting FAQ
When is the last spring frost in Milton, MA?
On average, the last spring frost in Milton is around April 18 (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 Milton, MA?
In Milton, 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 Milton in?
Milton 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 Milton?
Milton has about 191 frost-free days — a moderate growing season — between the average last spring frost (April 18) and first fall frost (October 26).
When should I plant tomatoes in Milton?
For Milton, sow tomatoes indoors about February 21–March 7 and move the seedlings out around April 25, after the last spring frost.
Never miss a window in Milton
An email when it’s time to start seeds, transplant, and sow — timed to Milton’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Quincy · 6 km
- Randolph Town · 7 km
- Braintree Town · 8 km
- Dedham · 8 km
- Brookline · 10 km
- Norwood · 11 km
- Boston · 12 km
- Weymouth Town · 12 km
Frost dates recorded at BLUE HILL COOP, 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 Milton, MA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00190736. Retrieved from https://blissgarden.com/massachusetts/milton.