Frost Dates for Maryville, TN
In Maryville, TN, the average last spring frost is around Apr 1 and the average first fall frost around Nov 2, for a growing season of about 215 days. For frost-tender plants, wait until Apr 17, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Knoxville Mcghee Tyson Airport, TN weather station, 5 miles away, elevation 962 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 17 | Oct 21 |
| 20% | Apr 12 | Oct 25 |
| 30% | Apr 7 | Oct 28 |
| 40% | Apr 4 | Oct 31 |
| 50% | Apr 1 | Nov 2 |
| 60% | Mar 29 | Nov 4 |
| 70% | Mar 24 | Nov 7 |
| 80% | Mar 19 | Nov 10 |
| 90% | Mar 14 | Nov 15 |
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 14 | Oct 24 |
| Frost / freeze (32°F) | Apr 1 | Nov 2 |
| Hard freeze (28°F) | Mar 19 | Nov 13 |
Planting calendar for Maryville
Transplant Apr 8 – Apr 22
Transplant Apr 15 – Apr 29
Transplant Apr 15 – Apr 29
Transplant Apr 8 – Apr 22
Sow or transplant Apr 8 – Apr 22
Sow or transplant Apr 8 – Apr 22
Sow or transplant Apr 15 – Apr 29
Sow or transplant Mar 4 – Mar 18
Fall sowing Sep 7 – Oct 5
Fall sowing Sep 7 – Sep 28
Fall sowing Aug 24 – Sep 7
Sow or transplant Mar 4 – Mar 18
Fall sowing Aug 24 – Sep 21
Transplant Mar 18 – Apr 1
Fall sowing Aug 10 – Aug 24
Transplant Mar 11 – Mar 25
Fall sowing Aug 10 – Aug 24
Fall sowing Aug 10 – Aug 24
Fall sowing Sep 21 – Oct 12
Fall sowing Aug 24 – Sep 7
Plant Mar 4 – Mar 18
Based on the average last frost (Apr 1) and first frost (Nov 2). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.