Frost dates for 37845Petros, TN
The average last spring frost in Petros is April 21 and the average first fall frost is October 17, giving a typical growing season of about 177 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 21
- Average first fall frost
- Oct 17
- Growing season
- 177 days
Safer after May 12 (1-in-10 risk)
Possible by Oct 4 (1-in-10 risk)
Last frost typically in 169 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 17 · May 4 · May 22 | Sep 27 · Oct 8 · Oct 20 | 158 days | 100% |
| Frost / freeze (32°F) | Apr 4 · Apr 21 · May 12 | Oct 4 · Oct 17 · Oct 30 | 177 days | 100% |
| Hard freeze (28°F) | Mar 20 · Apr 5 · Apr 27 | Oct 14 · Oct 27 · Nov 11 | 203 days | 100% |
Planting calendar for Petros
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 21 – May 27 |
| Tomatoes | Transplant outdoors | May 7 – Jun 27 |
| Peppers | Start seeds indoors | Mar 21 – Apr 21 |
| Peppers | Transplant outdoors | May 21 – Jun 21 |
| Eggplant | Start seeds indoors | Apr 7 – May 6 |
| Eggplant | Transplant outdoors | May 21 – Jun 21 |
| Cucumbers | Sow outdoors | May 21 – Jul 7 |
| Summer squash | Sow outdoors | May 7 – Jun 21 |
| Winter squash & pumpkins | Sow outdoors | May 21 – Jun 21 |
| Snap beans | Sow outdoors | May 7 – Jul 30 |
| Sweet corn | Sow outdoors | May 7 – Jun 27 |
| Watermelon & cantaloupe | Sow outdoors | May 21 – Jun 21 |
| Okra | Sow outdoors | May 14 – Jun 6 |
| Peas | Sow outdoors (spring) | Mar 21 – May 6 |
| Potatoes | Plant outdoors (spring) | Mar 21 – May 21 |
| Onions | Start seeds indoors (spring) | Feb 7 – Mar 6 |
| Onions | Transplant outdoors (spring) | Apr 7 – May 6 |
| Broccoli | Start seeds indoors (spring) | Mar 3 – Apr 6 |
| Broccoli | Transplant outdoors (spring) | Apr 7 – May 6 |
| Broccoli | Start seeds indoors (fall) | Jun 17 – Jun 27 |
| Broccoli | Transplant outdoors (fall) | Jul 17 – Jul 28 |
| Cabbage | Start seeds indoors (spring) | Feb 21 – Mar 21 |
| Cabbage | Transplant outdoors (spring) | Mar 21 – Apr 21 |
| Cabbage | Start seeds indoors (fall) | Jun 7 – Jul 7 |
| Cabbage | Transplant outdoors (fall) | Jul 7 – Aug 7 |
| Leaf lettuce | Sow outdoors (spring) | Mar 21 – Jun 6 |
| Leaf lettuce | Sow outdoors (fall) | Jul 7 – Aug 23 |
| Spinach | Sow outdoors (spring) | Mar 14 – Apr 27 |
| Spinach | Sow outdoors (fall) | Jul 24 – Aug 28 |
| Radishes | Sow outdoors (spring) | Mar 21 – May 11 |
| Radishes | Sow outdoors (fall) | Jul 7 – Sep 7 |
| Kale | Sow outdoors (spring) | Apr 7 – Apr 27 |
| Kale | Sow outdoors (fall) | Jun 30 – Aug 7 |
| Carrots | Sow outdoors (spring) | Apr 21 – Jun 6 |
| Carrots | Sow outdoors (fall) | Jun 7 – Jul 23 |
| Garlic | Plant outdoors (fall) | Oct 7 – Nov 7 |
Where these dates come from
ZIP code 37845 is matched to the NOAA station Lancing 6 Nw, TN, 26.4 km away, at 1,520 ft elevation (181 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Lancing 6 Nw, TN (used) | 1,520 ft | Apr 21 | Oct 17 |
| Oak Ridge Asos, TN | 910 ft | Mar 31 | Nov 4 |
| Oak Ridge Atdd, TN | 905 ft | Apr 5 | Nov 1 |
| Kingston, TN | 814 ft | Apr 3 | Nov 4 |
Frost dates near Petros
- Coalfield, TN 37719 · last Apr 5, first Nov 1
- Oliver Springs, TN 37840 · last Apr 5, first Nov 1
- Wartburg, TN 37887 · last Apr 21, first Oct 17
- Briceville, TN 37710 · last Apr 21, first Oct 17
- Oakdale, TN 37829 · last Apr 3, first Nov 4
- Oak Ridge, TN 37830 · last Apr 5, first Nov 1
- Harriman, TN 37748 · last Apr 3, first Nov 4
- Clinton, TN 37716 · last Mar 31, first Nov 4
Frequently asked questions
- When is the last frost in Petros, TN?
- For ZIP code 37845, the average last spring frost (32°F) is April 21, based on NOAA 1991-2020 climate normals for the Lancing 6 Nw, TN weather station. There is a 1-in-10 chance of a frost after May 12.
- When is the first frost in Petros, TN?
- The average first fall frost (32°F) is October 17. There is a 1-in-10 chance of frost by October 4, so tender plants are at risk from that point on.
- How long is the growing season in 37845?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 177 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.