When to plant in Wellesley, MA
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Wellesley, Massachusetts — all computed from Wellesley's nearest NOAA weather station.
Zone 6b means Wellesley sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
NATICK · 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 Wellesley’s own odds, recorded at NATICK.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 19 | May 7 | Apr 26 | Sep 26 | Oct 4 | Oct 15 |
| 32°F | May 9 | Apr 26 | Apr 14 | Oct 1 | Oct 12 | Oct 26 |
| 28°F | Apr 24 | Apr 13 | Apr 2 | Oct 10 | Oct 24 | Nov 6 |
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 Wellesley, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 16 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.
Wellesley planting FAQ
When is the last spring frost in Wellesley, MA?
On average, the last spring frost in Wellesley is around April 26 (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 Wellesley, MA?
Expect Wellesley's first fall frost near October 12 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Wellesley in?
Wellesley 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 Wellesley?
There are roughly 169 frost-free days in Wellesley (a moderate growing season), running from the average last frost around April 26 to the first fall frost near October 12.
When should I plant tomatoes in Wellesley?
In Wellesley, start tomato seeds indoors around March 1–March 15, then transplant seedlings outdoors around May 3 once the danger of frost has passed.
Never miss a window in Wellesley
An email when it’s time to start seeds, transplant, and sow — timed to Wellesley’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at NATICK, 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 Wellesley, MA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00195175. Retrieved from https://blissgarden.com/massachusetts/wellesley.