Frost dates for 38463Iron City, TN
The average last spring frost in Iron City is April 14 and the average first fall frost is October 24, giving a typical growing season of about 192 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 14
- Average first fall frost
- Oct 24
- Growing season
- 192 days
Safer after Apr 30 (1-in-10 risk)
Possible by Oct 12 (1-in-10 risk)
Last frost typically in 162 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 10 · Apr 26 · May 11 | Oct 2 · Oct 15 · Oct 28 | 173 days | 100% |
| Frost / freeze (32°F) | Mar 28 · Apr 14 · Apr 30 | Oct 12 · Oct 24 · Nov 7 | 192 days | 100% |
| Hard freeze (28°F) | Mar 14 · Apr 2 · Apr 19 | Oct 21 · Nov 3 · Nov 17 | 214 days | 100% |
Planting calendar for Iron City
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 14 – May 20 |
| Tomatoes | Transplant outdoors | Apr 30 – Jul 4 |
| Peppers | Start seeds indoors | Mar 14 – Apr 14 |
| Peppers | Transplant outdoors | May 14 – Jun 14 |
| Eggplant | Start seeds indoors | Mar 31 – Apr 29 |
| Eggplant | Transplant outdoors | May 14 – Jun 14 |
| Cucumbers | Sow outdoors | May 14 – Jul 14 |
| Summer squash | Sow outdoors | Apr 30 – Jun 14 |
| Winter squash & pumpkins | Sow outdoors | May 14 – Jun 14 |
| Snap beans | Sow outdoors | Apr 30 – Aug 6 |
| Sweet corn | Sow outdoors | Apr 30 – Jul 4 |
| Watermelon & cantaloupe | Sow outdoors | May 14 – Jun 14 |
| Okra | Sow outdoors | May 7 – May 30 |
| Peas | Sow outdoors (spring) | Mar 14 – Apr 29 |
| Potatoes | Plant outdoors (spring) | Mar 14 – May 14 |
| Onions | Start seeds indoors (spring) | Jan 31 – Feb 27 |
| Onions | Transplant outdoors (spring) | Mar 31 – Apr 29 |
| Broccoli | Start seeds indoors (spring) | Feb 24 – Mar 30 |
| Broccoli | Transplant outdoors (spring) | Mar 31 – Apr 29 |
| Broccoli | Start seeds indoors (fall) | Jun 24 – Jul 4 |
| Broccoli | Transplant outdoors (fall) | Jul 24 – Aug 4 |
| Cabbage | Start seeds indoors (spring) | Feb 14 – Mar 14 |
| Cabbage | Transplant outdoors (spring) | Mar 14 – Apr 14 |
| Cabbage | Start seeds indoors (fall) | Jun 14 – Jul 14 |
| Cabbage | Transplant outdoors (fall) | Jul 14 – Aug 14 |
| Leaf lettuce | Sow outdoors (spring) | Mar 14 – May 30 |
| Leaf lettuce | Sow outdoors (fall) | Jul 14 – Aug 30 |
| Spinach | Sow outdoors (spring) | Mar 7 – Apr 20 |
| Spinach | Sow outdoors (fall) | Jul 31 – Sep 4 |
| Radishes | Sow outdoors (spring) | Mar 14 – May 4 |
| Radishes | Sow outdoors (fall) | Jul 14 – Sep 14 |
| Kale | Sow outdoors (spring) | Mar 31 – Apr 20 |
| Kale | Sow outdoors (fall) | Jul 7 – Aug 14 |
| Carrots | Sow outdoors (spring) | Apr 14 – May 30 |
| Carrots | Sow outdoors (fall) | Jun 14 – Jul 30 |
| Garlic | Plant outdoors (fall) | Oct 14 – Nov 14 |
Where these dates come from
ZIP code 38463 is matched to the NOAA station Waynesboro, TN, 29.4 km away, at 750 ft elevation (51 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Waynesboro, TN (used) | 750 ft | Apr 14 | Oct 24 |
| Lexington, AL | 760 ft | Mar 29 | Nov 4 |
| Muscle Shoals 2 N, AL | 530 ft | Mar 27 | Nov 3 |
| Muscle Shoals Wtp, AL | 540 ft | Mar 30 | Nov 3 |
Frost dates near Iron City
- Cypress Inn, TN 38452 · last Apr 14, first Oct 24
- Saint Joseph, TN 38481 · last Mar 29, first Nov 4
- Collinwood, TN 38450 · last Apr 14, first Oct 24
- Westpoint, TN 38486 · last Apr 8, first Oct 31
- Florence, AL 35634 · last Mar 20, first Nov 8
- Cloverdale, AL 35617 · last Mar 20, first Nov 8
- Loretto, TN 38469 · last Apr 8, first Oct 31
- Killen, AL 35645 · last Mar 20, first Nov 8
Frequently asked questions
- When is the last frost in Iron City, TN?
- For ZIP code 38463, the average last spring frost (32°F) is April 14, based on NOAA 1991-2020 climate normals for the Waynesboro, TN weather station. There is a 1-in-10 chance of a frost after April 30.
- When is the first frost in Iron City, TN?
- The average first fall frost (32°F) is October 24. There is a 1-in-10 chance of frost by October 12, so tender plants are at risk from that point on.
- How long is the growing season in 38463?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 192 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.