Frost dates for 37777Louisville, TN
The average last spring frost in Louisville is April 1 and the average first fall frost is November 2, giving a typical growing season of about 215 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 1
- Average first fall frost
- Nov 2
- Growing season
- 215 days
Safer after Apr 17 (1-in-10 risk)
Possible by Oct 21 (1-in-10 risk)
Last frost typically in 149 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Mar 27 · Apr 14 · May 2 | Oct 12 · Oct 24 · Nov 5 | 191 days | 100% |
| Frost / freeze (32°F) | Mar 14 · Apr 1 · Apr 17 | Oct 21 · Nov 2 · Nov 15 | 215 days | 100% |
| Hard freeze (28°F) | Feb 28 · Mar 19 · Apr 5 | Nov 1 · Nov 13 · Dec 1 | 239 days | 100% |
Planting calendar for Louisville
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 1 – May 7 |
| Tomatoes | Transplant outdoors | Apr 17 – Jul 13 |
| Peppers | Start seeds indoors | Mar 1 – Apr 1 |
| Peppers | Transplant outdoors | May 1 – Jun 1 |
| Eggplant | Start seeds indoors | Mar 18 – Apr 16 |
| Eggplant | Transplant outdoors | May 1 – Jun 1 |
| Cucumbers | Sow outdoors | May 1 – Jul 23 |
| Summer squash | Sow outdoors | Apr 17 – Jun 1 |
| Winter squash & pumpkins | Sow outdoors | May 1 – Jun 1 |
| Snap beans | Sow outdoors | Apr 17 – Aug 15 |
| Sweet corn | Sow outdoors | Apr 17 – Jul 13 |
| Watermelon & cantaloupe | Sow outdoors | May 1 – Jun 1 |
| Okra | Sow outdoors | Apr 24 – May 17 |
| Peas | Sow outdoors (spring) | Mar 1 – Apr 16 |
| Potatoes | Plant outdoors (spring) | Mar 1 – May 1 |
| Onions | Start seeds indoors (spring) | Jan 18 – Feb 14 |
| Onions | Transplant outdoors (spring) | Mar 18 – Apr 16 |
| Broccoli | Start seeds indoors (spring) | Feb 11 – Mar 17 |
| Broccoli | Transplant outdoors (spring) | Mar 18 – Apr 16 |
| Broccoli | Start seeds indoors (fall) | Jul 3 – Jul 13 |
| Broccoli | Transplant outdoors (fall) | Aug 2 – Aug 13 |
| Cabbage | Start seeds indoors (spring) | Feb 1 – Mar 1 |
| Cabbage | Transplant outdoors (spring) | Mar 1 – Apr 1 |
| Cabbage | Start seeds indoors (fall) | Jun 23 – Jul 23 |
| Cabbage | Transplant outdoors (fall) | Jul 23 – Aug 23 |
| Leaf lettuce | Sow outdoors (spring) | Mar 1 – May 17 |
| Leaf lettuce | Sow outdoors (fall) | Jul 23 – Sep 8 |
| Spinach | Sow outdoors (spring) | Feb 22 – Apr 7 |
| Spinach | Sow outdoors (fall) | Aug 9 – Sep 13 |
| Radishes | Sow outdoors (spring) | Mar 1 – Apr 21 |
| Radishes | Sow outdoors (fall) | Jul 23 – Sep 23 |
| Kale | Sow outdoors (spring) | Mar 18 – Apr 7 |
| Kale | Sow outdoors (fall) | Jul 16 – Aug 23 |
| Carrots | Sow outdoors (spring) | Apr 1 – May 17 |
| Carrots | Sow outdoors (fall) | Jun 23 – Aug 8 |
| Garlic | Plant outdoors (fall) | Oct 23 – Nov 23 |
Where these dates come from
ZIP code 37777 is matched to the NOAA station Knoxville Mcghee Tyson Ap, TN, 3 km away, at 962 ft elevation (106 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Knoxville Mcghee Tyson Ap, TN (used) | 962 ft | Apr 1 | Nov 2 |
| Knoxville Exp Stn, TN | 830 ft | Apr 11 | Oct 28 |
| Lenoir City, TN | 785 ft | Apr 5 | Nov 1 |
| Oak Ridge Atdd, TN | 905 ft | Apr 5 | Nov 1 |
Frost dates near Louisville
- Rockford, TN 37853 · last Apr 1, first Nov 2
- Alcoa, TN 37701 · last Apr 1, first Nov 2
- Knoxville, TN 37930 · last Apr 11, first Oct 28
- Maryville, TN 37802 · last Apr 1, first Nov 2
- Friendsville, TN 37737 · last Apr 1, first Nov 2
- Walland, TN 37886 · last Apr 1, first Nov 2
- Lenoir City, TN 37772 · last Apr 5, first Nov 1
- Powell, TN 37849 · last Apr 22, first Oct 25
Frequently asked questions
- When is the last frost in Louisville, TN?
- For ZIP code 37777, the average last spring frost (32°F) is April 1, based on NOAA 1991-2020 climate normals for the Knoxville Mcghee Tyson Ap, TN weather station. There is a 1-in-10 chance of a frost after April 17.
- When is the first frost in Louisville, TN?
- The average first fall frost (32°F) is November 2. There is a 1-in-10 chance of frost by October 21, so tender plants are at risk from that point on.
- How long is the growing season in 37777?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 215 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.