Frost Dates for Brockton, MA
In Brockton, MA, the average last spring frost is around Apr 22 and the average first fall frost around Oct 19, for a growing season of about 178 days. For frost-tender plants, wait until May 5, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Brockton, MA weather station, 3 miles away, elevation 75 ft. Frost can come earlier in low spots and valleys and later near cities and large lakes.
Frost probability by date
Chance of a 32°F frost after the spring date, or before the fall date.
| Chance | Last spring frost | First fall frost |
|---|---|---|
| 10% | May 5 | Oct 5 |
| 20% | May 1 | Oct 9 |
| 30% | Apr 28 | Oct 13 |
| 40% | Apr 25 | Oct 16 |
| 50% | Apr 22 | Oct 19 |
| 60% | Apr 20 | Oct 22 |
| 70% | Apr 17 | Oct 25 |
| 80% | Apr 13 | Oct 28 |
| 90% | Apr 8 | Nov 3 |
Light frost vs. hard freeze
Average (50%) dates for each temperature. Tender plants are damaged at 36°F; most hardy crops survive until 28°F.
| Temperature | Last in spring | First in fall |
|---|---|---|
| Light frost (36°F) | May 5 | Oct 7 |
| Frost / freeze (32°F) | Apr 22 | Oct 19 |
| Hard freeze (28°F) | Apr 6 | Oct 31 |
Planting calendar for Brockton
Transplant Apr 29 – May 13
Transplant May 6 – May 20
Transplant May 6 – May 20
Transplant Apr 29 – May 13
Sow or transplant Apr 29 – May 13
Sow or transplant Apr 29 – May 13
Sow or transplant May 6 – May 20
Sow or transplant Mar 25 – Apr 8
Fall sowing Aug 24 – Sep 21
Fall sowing Aug 24 – Sep 14
Fall sowing Aug 10 – Aug 24
Sow or transplant Mar 25 – Apr 8
Fall sowing Aug 10 – Sep 7
Transplant Apr 8 – Apr 22
Fall sowing Jul 27 – Aug 10
Transplant Apr 1 – Apr 15
Fall sowing Jul 27 – Aug 10
Fall sowing Jul 27 – Aug 10
Fall sowing Sep 7 – Sep 28
Fall sowing Aug 10 – Aug 24
Plant Mar 25 – Apr 8
Based on the average last frost (Apr 22) and first frost (Oct 19). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.