Frost dates for 37729Duff, TN
The average last spring frost in Duff is April 18 and the average first fall frost is October 24, giving a typical growing season of about 187 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 18
- Average first fall frost
- Oct 24
- Growing season
- 187 days
Safer after May 3 (1-in-10 risk)
Possible by Oct 11 (1-in-10 risk)
Last frost typically in 166 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) | Apr 16 · Apr 30 · May 13 | Oct 4 · Oct 15 · Oct 26 | 168 days | 100% |
| Frost / freeze (32°F) | Apr 3 · Apr 18 · May 3 | Oct 11 · Oct 24 · Nov 4 | 187 days | 100% |
| Hard freeze (28°F) | Mar 18 · Apr 3 · Apr 20 | Oct 19 · Nov 1 · Nov 16 | 211 days | 100% |
Planting calendar for Duff
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 18 – May 24 |
| Tomatoes | Transplant outdoors | May 4 – Jul 4 |
| Peppers | Start seeds indoors | Mar 18 – Apr 18 |
| Peppers | Transplant outdoors | May 18 – Jun 18 |
| Eggplant | Start seeds indoors | Apr 4 – May 3 |
| Eggplant | Transplant outdoors | May 18 – Jun 18 |
| Cucumbers | Sow outdoors | May 18 – Jul 14 |
| Summer squash | Sow outdoors | May 4 – Jun 18 |
| Winter squash & pumpkins | Sow outdoors | May 18 – Jun 18 |
| Snap beans | Sow outdoors | May 4 – Aug 6 |
| Sweet corn | Sow outdoors | May 4 – Jul 4 |
| Watermelon & cantaloupe | Sow outdoors | May 18 – Jun 18 |
| Okra | Sow outdoors | May 11 – Jun 3 |
| Peas | Sow outdoors (spring) | Mar 18 – May 3 |
| Potatoes | Plant outdoors (spring) | Mar 18 – May 18 |
| Onions | Start seeds indoors (spring) | Feb 4 – Mar 3 |
| Onions | Transplant outdoors (spring) | Apr 4 – May 3 |
| Broccoli | Start seeds indoors (spring) | Feb 28 – Apr 3 |
| Broccoli | Transplant outdoors (spring) | Apr 4 – May 3 |
| Broccoli | Start seeds indoors (fall) | Jun 24 – Jul 4 |
| Broccoli | Transplant outdoors (fall) | Jul 24 – Aug 4 |
| Cabbage | Start seeds indoors (spring) | Feb 18 – Mar 18 |
| Cabbage | Transplant outdoors (spring) | Mar 18 – Apr 18 |
| Cabbage | Start seeds indoors (fall) | Jun 14 – Jul 14 |
| Cabbage | Transplant outdoors (fall) | Jul 14 – Aug 14 |
| Leaf lettuce | Sow outdoors (spring) | Mar 18 – Jun 3 |
| Leaf lettuce | Sow outdoors (fall) | Jul 14 – Aug 30 |
| Spinach | Sow outdoors (spring) | Mar 11 – Apr 24 |
| Spinach | Sow outdoors (fall) | Jul 31 – Sep 4 |
| Radishes | Sow outdoors (spring) | Mar 18 – May 8 |
| Radishes | Sow outdoors (fall) | Jul 14 – Sep 14 |
| Kale | Sow outdoors (spring) | Apr 4 – Apr 24 |
| Kale | Sow outdoors (fall) | Jul 7 – Aug 14 |
| Carrots | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Carrots | Sow outdoors (fall) | Jun 14 – Jul 30 |
| Garlic | Plant outdoors (fall) | Oct 14 – Nov 14 |
Where these dates come from
ZIP code 37729 is matched to the NOAA station Newcomb, TN, 12.4 km away, at 1,014 ft elevation (1,302 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Newcomb, TN (used) | 1,014 ft | Apr 18 | Oct 24 |
| Williamsburg, KY | 940 ft | Apr 21 | Oct 22 |
| Norris, TN | 1,110 ft | Apr 22 | Oct 25 |
| Stearns 2S, KY | 1,220 ft | Apr 24 | Oct 18 |
Frost dates near Duff
- Eagan, TN 37730 · last Apr 18, first Oct 24
- La Follette, TN 37766 · last Apr 18, first Oct 24
- Jellico, TN 37762 · last Apr 18, first Oct 24
- Clairfield, TN 37715 · last Apr 23, first Oct 19
- Newcomb, TN 37819 · last Apr 18, first Oct 24
- Frakes, KY 40940 · last Apr 18, first Oct 24
- Pruden, TN 37851 · last Apr 18, first Oct 24
- Speedwell, TN 37870 · last Apr 23, first Oct 19
Frequently asked questions
- When is the last frost in Duff, TN?
- For ZIP code 37729, the average last spring frost (32°F) is April 18, based on NOAA 1991-2020 climate normals for the Newcomb, TN weather station. There is a 1-in-10 chance of a frost after May 3.
- When is the first frost in Duff, TN?
- The average first fall frost (32°F) is October 24. There is a 1-in-10 chance of frost by October 11, so tender plants are at risk from that point on.
- How long is the growing season in 37729?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 187 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.