When to plant in Union City, TN
USDA Zone 7bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Union City, Tennessee — all computed from Union City's nearest NOAA weather station.
In zone 7b, Union City supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
UNION CITY · 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 Union City’s own odds, recorded at UNION CITY.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 28 | Apr 15 | Mar 30 | Oct 7 | Oct 19 | Oct 30 |
| 32°F | Apr 19 | Apr 3 | Mar 18 | Oct 17 | Oct 29 | Nov 10 |
| 28°F | Apr 8 | Mar 22 | Mar 4 | Oct 26 | Nov 7 | Nov 26 |
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 Union City, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 23 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.
Union City planting FAQ
When is the last spring frost in Union City, TN?
Plan for the last spring frost in Union City around April 3 (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 Union City, TN?
In Union City, the first 32°F freeze of fall lands around October 29 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Union City in?
Union City 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 Union City?
Union City has about 209 frost-free days — a moderate growing season — between the average last spring frost (April 3) and first fall frost (October 29).
When should I plant tomatoes in Union City?
For Union City, sow tomatoes indoors about February 6–February 20 and move the seedlings out around April 10, after the last spring frost.
Never miss a window in Union City
An email when it’s time to start seeds, transplant, and sow — timed to Union City’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at UNION CITY, 4 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 Union City, TN — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00409219. Retrieved from https://blissgarden.com/tennessee/union-city.