When to plant in Seymour, TN
USDA Zone 7bEverything below — frost dates, hardiness zone, and what to plant when in Seymour, Tennessee — is derived from the closest NOAA station with complete climate normals.
These dates come from a station roughly 16 km away, the closest with full normals; terrain around Seymour (elevation, water, pavement) can move your real frost dates a few days either way. In zone 7b, Seymour supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
The average last spring frost in Seymour is now 7 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
SEVIERVILLE · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Seymour’s own odds, recorded at SEVIERVILLE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 5 | Apr 19 | Apr 4 | Oct 9 | Oct 21 | Nov 1 |
| 32°F | Apr 21 | Apr 6 | Mar 23 | Oct 16 | Oct 29 | Nov 11 |
| 28°F | Apr 9 | Mar 27 | Mar 8 | Oct 25 | Nov 7 | Nov 24 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Seymour, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 21 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Seymour planting FAQ
When is the last spring frost in Seymour, TN?
Plan for the last spring frost in Seymour around April 6 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Seymour, TN?
The first fall frost in Seymour typically arrives around October 29 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Seymour in?
Seymour is in USDA hardiness zone 7b. In zone 7b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Seymour?
Seymour has about 206 frost-free days — a moderate growing season — between the average last spring frost (April 6) and first fall frost (October 29).
When should I plant tomatoes in Seymour?
For Seymour, sow tomatoes indoors about February 9–February 23 and move the seedlings out around April 13, after the last spring frost.
Never miss a window in Seymour
An email when it’s time to start seeds, transplant, and sow — timed to Seymour’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at SEVIERVILLE, 16 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Seymour, TN — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00408179. Retrieved from https://blissgarden.com/tennessee/seymour.