USDA Hardiness Zone 7b
Frost Dates for 37381 — Spring City, Tennessee
Averages from Spring City, Tn US, the nearest reporting station, 1.7 miles away.
Plant tender crops after April 11, and expect the first autumn freeze around October 29. That leaves about 200 frost-free days.
- Last spring frost
- April 11
- First fall frost
- October 29
- Growing season
- 200 days
- Hardiness zone
- 7b
50% probability
50% probability
frost-free
5 to 10°F annual low
- First snow
- January 17
- Last snow
- February 4
- Winters with snow
- 100%
- Snow per year
- 3.3"
median, 1991–2020
median, 1991–2020
19 of 19 observed
NOAA normal
When it snows in Spring City, Tennessee
The first measurable snow (0.1 inch or more) in Spring City, Tennessee usually arrives around January 17, and the last of the season around February 4. Those are the middle dates across the winters of 1991–2020 at Decatur 7ne, Tn US, 9.7 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow.
For a gardener, snow matters less than frost: a light snow on frozen ground changes nothing, while a hard frost on an unprotected bed ends the season. Use the frost dates above for planting and the snow dates for getting hoses drained, mulch down and tender pots indoors.
Planting calendar for 37381
| When | What to do |
|---|---|
| January 31 – February 14 | Start peppers and aubergines indoors They need eight to ten weeks under lights before they can go out. |
| February 14 – February 28 | Start tomatoes indoors Six to eight weeks gives a transplant big enough to set fruit early. |
| March 14 – March 28 | Sow peas, spinach, lettuce, radish outdoors These tolerate light frost and prefer to germinate in cool soil. |
| April 11 onward | Transplant tomatoes, peppers, basil, squash, cucumbers The average last freeze has passed — still watch the actual forecast. |
| by August 6 | Sow the autumn crop of carrots, beets and brassicas They need about twelve weeks to size up before growth stops. |
| by October 15 | Harvest tender crops, or be ready to cover them A first freeze two weeks early is well within normal variation. |
| October 29 onward | Plant garlic, mulch beds, lift tender bulbs Garlic wants a cold spell; bare soil loses structure over winter. |
What these dates mean
Wait until after April 11 to put tender plants — tomatoes, peppers, basil, squash — in the ground. That is the date by which half of years in Spring City, Tennessee are past their last freeze. Harvest before October 29, which leaves roughly 200 frost-free days.
ZIP 37381 sits in USDA hardiness zone 7b, meaning the average coldest night of the year falls between 5 to 10°F. Zone decides what survives the winter; frost dates decide when to plant each spring. They are different questions, and a plant can pass one and fail the other.
These are thirty-year NOAA averages for 1991–2020, not a forecast. Any individual year can frost two to three weeks either side of these dates, so check the actual forecast before planting out.