Frost dates for 37814Morristown, TN
The average last spring frost in Morristown is April 10 and the average first fall frost is October 28, giving a typical growing season of about 201 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 10
- Average first fall frost
- Oct 28
- Growing season
- 201 days
Safer after Apr 26 (1-in-10 risk)
Possible by Oct 16 (1-in-10 risk)
Last frost typically in 158 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 5 · Apr 22 · May 8 | Oct 9 · Oct 20 · Nov 1 | 181 days | 100% |
| Frost / freeze (32°F) | Mar 25 · Apr 10 · Apr 26 | Oct 16 · Oct 28 · Nov 9 | 201 days | 100% |
| Hard freeze (28°F) | Mar 11 · Mar 29 · Apr 14 | Oct 26 · Nov 6 · Nov 22 | 224 days | 100% |
Planting calendar for Morristown
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 10 – May 16 |
| Tomatoes | Transplant outdoors | Apr 26 – Jul 8 |
| Peppers | Start seeds indoors | Mar 10 – Apr 10 |
| Peppers | Transplant outdoors | May 10 – Jun 10 |
| Eggplant | Start seeds indoors | Mar 27 – Apr 25 |
| Eggplant | Transplant outdoors | May 10 – Jun 10 |
| Cucumbers | Sow outdoors | May 10 – Jul 18 |
| Summer squash | Sow outdoors | Apr 26 – Jun 10 |
| Winter squash & pumpkins | Sow outdoors | May 10 – Jun 10 |
| Snap beans | Sow outdoors | Apr 26 – Aug 10 |
| Sweet corn | Sow outdoors | Apr 26 – Jul 8 |
| Watermelon & cantaloupe | Sow outdoors | May 10 – Jun 10 |
| Okra | Sow outdoors | May 3 – May 26 |
| Peas | Sow outdoors (spring) | Mar 10 – Apr 25 |
| Potatoes | Plant outdoors (spring) | Mar 10 – May 10 |
| Onions | Start seeds indoors (spring) | Jan 27 – Feb 23 |
| Onions | Transplant outdoors (spring) | Mar 27 – Apr 25 |
| Broccoli | Start seeds indoors (spring) | Feb 20 – Mar 26 |
| Broccoli | Transplant outdoors (spring) | Mar 27 – Apr 25 |
| Broccoli | Start seeds indoors (fall) | Jun 28 – Jul 8 |
| Broccoli | Transplant outdoors (fall) | Jul 28 – Aug 8 |
| Cabbage | Start seeds indoors (spring) | Feb 10 – Mar 10 |
| Cabbage | Transplant outdoors (spring) | Mar 10 – Apr 10 |
| Cabbage | Start seeds indoors (fall) | Jun 18 – Jul 18 |
| Cabbage | Transplant outdoors (fall) | Jul 18 – Aug 18 |
| Leaf lettuce | Sow outdoors (spring) | Mar 10 – May 26 |
| Leaf lettuce | Sow outdoors (fall) | Jul 18 – Sep 3 |
| Spinach | Sow outdoors (spring) | Mar 3 – Apr 16 |
| Spinach | Sow outdoors (fall) | Aug 4 – Sep 8 |
| Radishes | Sow outdoors (spring) | Mar 10 – Apr 30 |
| Radishes | Sow outdoors (fall) | Jul 18 – Sep 18 |
| Kale | Sow outdoors (spring) | Mar 27 – Apr 16 |
| Kale | Sow outdoors (fall) | Jul 11 – Aug 18 |
| Carrots | Sow outdoors (spring) | Apr 10 – May 26 |
| Carrots | Sow outdoors (fall) | Jun 18 – Aug 3 |
| Garlic | Plant outdoors (fall) | Oct 18 – Nov 18 |
Where these dates come from
ZIP code 37814 is matched to the NOAA station Morristown Radio Wcrk, TN, 2.7 km away, at 1,344 ft elevation (120 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Morristown Radio Wcrk, TN (used) | 1,344 ft | Apr 10 | Oct 28 |
| Morristown Wfo, TN | 1,320 ft | Mar 31 | Nov 4 |
| Jefferson City, TN | 1,108 ft | Apr 24 | Oct 17 |
| Newport 1 Nw, TN | 1,036 ft | Apr 7 | Oct 29 |
Frost dates near Morristown
- Lowland, TN 37778 · last Apr 10, first Oct 28
- Morristown, TN 37815 · last Apr 10, first Oct 28
- Bean Station, TN 37708 · last Apr 10, first Oct 28
- Russellville, TN 37860 · last Apr 10, first Oct 28
- Talbott, TN 37877 · last Mar 31, first Nov 4
- Whitesburg, TN 37891 · last Apr 10, first Oct 28
- White Pine, TN 37890 · last Apr 7, first Oct 29
- Mooresburg, TN 37811 · last Apr 10, first Oct 28
Frequently asked questions
- When is the last frost in Morristown, TN?
- For ZIP code 37814, the average last spring frost (32°F) is April 10, based on NOAA 1991-2020 climate normals for the Morristown Radio Wcrk, TN weather station. There is a 1-in-10 chance of a frost after April 26.
- When is the first frost in Morristown, TN?
- The average first fall frost (32°F) is October 28. There is a 1-in-10 chance of frost by October 16, so tender plants are at risk from that point on.
- How long is the growing season in 37814?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 201 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.