Last spring frost
Apr 5
Frost Dates for Oronoque, CT
First fall frost
Nov 6
Growing season
216 days
Hardiness zone
7a
In an average year around Oronoque, CT, the last spring frost (32°F) is about Apr 5 and the first fall frost is about Nov 6, giving roughly a 216-day growing season. To be safe most years, wait until Mar 25 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Apr 29 | Apr 16 | Apr 6 |
| Freeze (32°F) | Apr 17 | Apr 5 | Mar 25 |
| Hard (28°F) | Apr 6 | Mar 26 | Mar 11 |
| Severe (24°F) | Mar 30 | Mar 15 | Feb 28 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 29 | Apr 24 | Apr 21 | Apr 19 | Apr 16 | Apr 14 | Apr 12 | Apr 9 | Apr 6 |
| 32°F | Apr 17 | Apr 13 | Apr 9 | Apr 7 | Apr 5 | Apr 3 | Apr 1 | Mar 30 | Mar 25 |
| 28°F | Apr 6 | Apr 3 | Mar 31 | Mar 29 | Mar 26 | Mar 23 | Mar 21 | Mar 16 | Mar 11 |
| 24°F | Mar 30 | Mar 25 | Mar 21 | Mar 18 | Mar 15 | Mar 12 | Mar 9 | Mar 6 | Feb 28 |
| 20°F | Mar 21 | Mar 17 | Mar 13 | Mar 9 | Mar 7 | Mar 4 | Feb 28 | Feb 24 | Feb 17 |
| 16°F | Mar 12 | Mar 7 | Mar 3 | Feb 28 | Feb 24 | Feb 19 | Feb 15 | Feb 10 | Feb 4 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Oct 11 | Oct 26 | Nov 8 |
| Freeze (32°F) | Oct 25 | Nov 6 | Nov 20 |
| Hard (28°F) | Nov 6 | Nov 19 | Dec 5 |
| Severe (24°F) | Nov 15 | Dec 1 | Dec 17 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 11 | Oct 17 | Oct 20 | Oct 23 | Oct 26 | Oct 29 | Nov 1 | Nov 4 | Nov 8 |
| 32°F | Oct 25 | Oct 30 | Nov 1 | Nov 4 | Nov 6 | Nov 9 | Nov 12 | Nov 16 | Nov 20 |
| 28°F | Nov 6 | Nov 11 | Nov 14 | Nov 16 | Nov 19 | Nov 22 | Nov 27 | Dec 1 | Dec 5 |
| 24°F | Nov 15 | Nov 21 | Nov 25 | Nov 29 | Dec 1 | Dec 4 | Dec 7 | Dec 11 | Dec 17 |
| 20°F | Nov 28 | Dec 3 | Dec 6 | Dec 10 | Dec 14 | Dec 18 | Dec 22 | Dec 26 | Jan 1 |
| 16°F | Dec 6 | Dec 15 | Dec 21 | Dec 25 | Dec 29 | Jan 1 | Jan 5 | Jan 9 | Jan 16 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Bridgeport Sikorsky Mem Ap, Ct, about 4.8 miles away@if(!empty($station['elevation_ft'])), at 5 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Oronoque, CT?
On average, the last spring frost (32°F) around Oronoque, CT is about Apr 5. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 25.
When is the first frost in the fall?
The first fall frost around Oronoque, CT typically arrives about Nov 6. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Apr 5 on average, or Mar 25 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 216 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 06614 Planting calendar → Connecticut frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026