Frost dates for 37803Maryville, TN
The average last spring frost in Maryville is April 17 and the average first fall frost is October 27, giving a typical growing season of about 193 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 17
- Average first fall frost
- Oct 27
- Growing season
- 193 days
Safer after May 4 (1-in-10 risk)
Possible by Oct 13 (1-in-10 risk)
Last frost typically in 165 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 13 · Apr 30 · May 14 | Oct 5 · Oct 17 · Nov 1 | 171 days | 100% |
| Frost / freeze (32°F) | Mar 29 · Apr 17 · May 4 | Oct 13 · Oct 27 · Nov 10 | 193 days | 100% |
| Hard freeze (28°F) | Mar 15 · Apr 2 · Apr 20 | Oct 23 · Nov 6 · Nov 23 | 218 days | 100% |
Planting calendar for Maryville
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 17 – May 23 |
| Tomatoes | Transplant outdoors | May 3 – Jul 7 |
| Peppers | Start seeds indoors | Mar 17 – Apr 17 |
| Peppers | Transplant outdoors | May 17 – Jun 17 |
| Eggplant | Start seeds indoors | Apr 3 – May 2 |
| Eggplant | Transplant outdoors | May 17 – Jun 17 |
| Cucumbers | Sow outdoors | May 17 – Jul 17 |
| Summer squash | Sow outdoors | May 3 – Jun 17 |
| Winter squash & pumpkins | Sow outdoors | May 17 – Jun 17 |
| Snap beans | Sow outdoors | May 3 – Aug 9 |
| Sweet corn | Sow outdoors | May 3 – Jul 7 |
| Watermelon & cantaloupe | Sow outdoors | May 17 – Jun 17 |
| Okra | Sow outdoors | May 10 – Jun 2 |
| Peas | Sow outdoors (spring) | Mar 17 – May 2 |
| Potatoes | Plant outdoors (spring) | Mar 17 – May 17 |
| Onions | Start seeds indoors (spring) | Feb 3 – Mar 2 |
| Onions | Transplant outdoors (spring) | Apr 3 – May 2 |
| Broccoli | Start seeds indoors (spring) | Feb 27 – Apr 2 |
| Broccoli | Transplant outdoors (spring) | Apr 3 – May 2 |
| Broccoli | Start seeds indoors (fall) | Jun 27 – Jul 7 |
| Broccoli | Transplant outdoors (fall) | Jul 27 – Aug 7 |
| Cabbage | Start seeds indoors (spring) | Feb 17 – Mar 17 |
| Cabbage | Transplant outdoors (spring) | Mar 17 – Apr 17 |
| Cabbage | Start seeds indoors (fall) | Jun 17 – Jul 17 |
| Cabbage | Transplant outdoors (fall) | Jul 17 – Aug 17 |
| Leaf lettuce | Sow outdoors (spring) | Mar 17 – Jun 2 |
| Leaf lettuce | Sow outdoors (fall) | Jul 17 – Sep 2 |
| Spinach | Sow outdoors (spring) | Mar 10 – Apr 23 |
| Spinach | Sow outdoors (fall) | Aug 3 – Sep 7 |
| Radishes | Sow outdoors (spring) | Mar 17 – May 7 |
| Radishes | Sow outdoors (fall) | Jul 17 – Sep 17 |
| Kale | Sow outdoors (spring) | Apr 3 – Apr 23 |
| Kale | Sow outdoors (fall) | Jul 10 – Aug 17 |
| Carrots | Sow outdoors (spring) | Apr 17 – Jun 2 |
| Carrots | Sow outdoors (fall) | Jun 17 – Aug 2 |
| Garlic | Plant outdoors (fall) | Oct 17 – Nov 17 |
Where these dates come from
ZIP code 37803 is matched to the NOAA station Tapoco, NC, 23.5 km away, at 1,110 ft elevation (19 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Tapoco, NC (used) | 1,110 ft | Apr 17 | Oct 27 |
| Knoxville Mcghee Tyson Ap, TN | 962 ft | Apr 1 | Nov 2 |
| Townsend 5S, TN | 1,893 ft | Apr 20 | Oct 22 |
| Knoxville Exp Stn, TN | 830 ft | Apr 11 | Oct 28 |
Frost dates near Maryville
- Tallassee, TN 37878 · last Apr 17, first Oct 27
- Maryville, TN 37801 · last Apr 1, first Nov 2
- Alcoa, TN 37701 · last Apr 1, first Nov 2
- Friendsville, TN 37737 · last Apr 1, first Nov 2
- Greenback, TN 37742 · last Apr 5, first Nov 1
- Walland, TN 37886 · last Apr 1, first Nov 2
- Rockford, TN 37853 · last Apr 1, first Nov 2
- Louisville, TN 37777 · last Apr 1, first Nov 2
Frequently asked questions
- When is the last frost in Maryville, TN?
- For ZIP code 37803, the average last spring frost (32°F) is April 17, based on NOAA 1991-2020 climate normals for the Tapoco, NC weather station. There is a 1-in-10 chance of a frost after May 4.
- When is the first frost in Maryville, TN?
- The average first fall frost (32°F) is October 27. There is a 1-in-10 chance of frost by October 13, so tender plants are at risk from that point on.
- How long is the growing season in 37803?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 193 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.