Last spring frost
Mar 24
Frost Dates for Chattanooga, TN
First fall frost
Nov 9
Growing season
230 days
Hardiness zone
8a
In an average year around Chattanooga, TN, the last spring frost (32°F) is about Mar 24 and the first fall frost is about Nov 9, giving roughly a 230-day growing season. To be safe most years, wait until Mar 6 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 20 | Apr 4 | Mar 19 |
| Freeze (32°F) | Apr 8 | Mar 24 | Mar 6 |
| Hard (28°F) | Mar 30 | Mar 11 | Feb 18 |
| Severe (24°F) | Mar 18 | Feb 23 | Jan 26 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 20 | Apr 14 | Apr 10 | Apr 7 | Apr 4 | Apr 1 | Mar 29 | Mar 25 | Mar 19 |
| 32°F | Apr 8 | Apr 3 | Mar 31 | Mar 28 | Mar 24 | Mar 20 | Mar 16 | Mar 12 | Mar 6 |
| 28°F | Mar 30 | Mar 23 | Mar 18 | Mar 15 | Mar 11 | Mar 7 | Mar 2 | Feb 25 | Feb 18 |
| 24°F | Mar 18 | Mar 11 | Mar 5 | Feb 28 | Feb 23 | Feb 18 | Feb 12 | Feb 3 | Jan 26 |
| 20°F | Mar 4 | Feb 25 | Feb 16 | Feb 9 | Feb 4 | Jan 31 | Jan 26 | Jan 19 | Jan 9 |
| 16°F | Feb 23 | Feb 7 | Feb 1 | Jan 28 | Jan 24 | Jan 18 | Jan 12 | Jan 8 | Jan 1 |
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 19 | Oct 31 | Nov 11 |
| Freeze (32°F) | Oct 27 | Nov 9 | Nov 26 |
| Hard (28°F) | Nov 6 | Nov 22 | Dec 13 |
| Severe (24°F) | Nov 16 | Dec 8 | Jan 5 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 19 | Oct 23 | Oct 26 | Oct 28 | Oct 31 | Nov 1 | Nov 4 | Nov 7 | Nov 11 |
| 32°F | Oct 27 | Nov 1 | Nov 3 | Nov 6 | Nov 9 | Nov 11 | Nov 14 | Nov 18 | Nov 26 |
| 28°F | Nov 6 | Nov 10 | Nov 14 | Nov 18 | Nov 22 | Nov 26 | Dec 1 | Dec 5 | Dec 13 |
| 24°F | Nov 16 | Nov 23 | Nov 30 | Dec 4 | Dec 8 | Dec 14 | Dec 21 | Dec 28 | Jan 5 |
| 20°F | Dec 4 | Dec 12 | Dec 21 | Dec 27 | Dec 31 | Jan 3 | Jan 8 | Jan 14 | Jan 25 |
| 16°F | Dec 21 | Dec 29 | Jan 2 | Jan 5 | Jan 9 | Jan 13 | Jan 17 | Jan 24 | Jan 31 |
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: Chattanooga Lovell Ap, Tn, about 5.3 miles away@if(!empty($station['elevation_ft'])), at 671 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 Chattanooga, TN?
On average, the last spring frost (32°F) around Chattanooga, TN is about Mar 24. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 6.
When is the first frost in the fall?
The first fall frost around Chattanooga, TN typically arrives about Nov 9. 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 Mar 24 on average, or Mar 6 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 230 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 37416 Planting calendar → Tennessee frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026