Frost Dates for Norwich, CT
In Norwich, CT, the average last spring frost is around Apr 14 and the average first fall frost around Oct 24, for a growing season of about 192 days. For frost-tender plants, wait until Apr 30, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Norwich Public Utility Plt, CT weather station, 2 miles away, elevation 20 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% | Apr 30 | Oct 9 |
| 20% | Apr 24 | Oct 13 |
| 30% | Apr 21 | Oct 17 |
| 40% | Apr 18 | Oct 20 |
| 50% | Apr 14 | Oct 24 |
| 60% | Apr 11 | Oct 27 |
| 70% | Apr 9 | Oct 31 |
| 80% | Apr 6 | Nov 3 |
| 90% | Apr 1 | Nov 7 |
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) | Apr 30 | Oct 12 |
| Frost / freeze (32°F) | Apr 14 | Oct 24 |
| Hard freeze (28°F) | Apr 1 | Nov 5 |
Planting calendar for Norwich
Transplant Apr 21 – May 5
Transplant Apr 28 – May 12
Transplant Apr 28 – May 12
Transplant Apr 21 – May 5
Sow or transplant Apr 21 – May 5
Sow or transplant Apr 21 – May 5
Sow or transplant Apr 28 – May 12
Sow or transplant Mar 17 – Mar 31
Fall sowing Aug 29 – Sep 26
Fall sowing Aug 29 – Sep 19
Fall sowing Aug 15 – Aug 29
Sow or transplant Mar 17 – Mar 31
Fall sowing Aug 15 – Sep 12
Transplant Mar 31 – Apr 14
Fall sowing Aug 1 – Aug 15
Transplant Mar 24 – Apr 7
Fall sowing Aug 1 – Aug 15
Fall sowing Aug 1 – Aug 15
Fall sowing Sep 12 – Oct 3
Fall sowing Aug 15 – Aug 29
Plant Mar 17 – Mar 31
Based on the average last frost (Apr 14) and first frost (Oct 24). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.