Frost Dates for Chattanooga, TN
In Chattanooga, TN, the average last spring frost is around Mar 24 and the average first fall frost around Nov 9, for a growing season of about 230 days. For frost-tender plants, wait until Apr 8, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Chattanooga Lovell Airport, TN weather station, 4 miles away, elevation 671 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 8 | Oct 27 |
| 20% | Apr 3 | Nov 1 |
| 30% | Mar 31 | Nov 3 |
| 40% | Mar 28 | Nov 6 |
| 50% | Mar 24 | Nov 9 |
| 60% | Mar 20 | Nov 11 |
| 70% | Mar 16 | Nov 14 |
| 80% | Mar 12 | Nov 18 |
| 90% | Mar 6 | Nov 26 |
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 4 | Oct 31 |
| Frost / freeze (32°F) | Mar 24 | Nov 9 |
| Hard freeze (28°F) | Mar 11 | Nov 22 |
Planting calendar for Chattanooga
Transplant Mar 31 – Apr 14
Transplant Apr 7 – Apr 21
Transplant Apr 7 – Apr 21
Transplant Mar 31 – Apr 14
Sow or transplant Mar 31 – Apr 14
Sow or transplant Mar 31 – Apr 14
Sow or transplant Apr 7 – Apr 21
Sow or transplant Feb 24 – Mar 10
Fall sowing Sep 14 – Oct 12
Fall sowing Sep 14 – Oct 5
Fall sowing Aug 31 – Sep 14
Sow or transplant Feb 24 – Mar 10
Fall sowing Aug 31 – Sep 28
Transplant Mar 10 – Mar 24
Fall sowing Aug 17 – Aug 31
Transplant Mar 3 – Mar 17
Fall sowing Aug 17 – Aug 31
Fall sowing Aug 17 – Aug 31
Fall sowing Sep 28 – Oct 19
Fall sowing Aug 31 – Sep 14
Plant Feb 24 – Mar 10
Based on the average last frost (Mar 24) and first frost (Nov 9). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.