Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 37306 — Belvidere, TN

ZIP code 37306 (Belvidere, Franklin County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 6 and the first fall frost October 29.

Where ZIP 37306 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone7b5 to 10 °F
Coldest night−15 to −12.2 °C
Last frostApr 6
First frostOct 29
2012 zone7b

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Belvidere, TN…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Belvidere, TN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 6median — 50% chance of a later frost
Safe for tender plantsApril 25only 10% chance of frost after
First fall frostOctober 29median — 10% chance by Oct 16
Growing season204 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 26 and returns around November 6.

From the NOAA station Winchester 5se, TN — 10 miles away, elevation 942 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 37306

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 23 – Mar 9
SpinachSow outdoors · Feb 23 – Mar 16
Broccoli, cabbageStart indoors · Jan 26 – Feb 9
Broccoli, cabbageTransplant · Mar 16 – Mar 30
Onion setsPlant outdoors · Mar 9 – Mar 23
PotatoesPlant outdoors · Mar 16 – Mar 30
LettuceSow outdoors · Mar 9 – Mar 23
Carrots, beetsSow outdoors · Mar 16 – Mar 30
TomatoesStart indoors · Feb 9 – Feb 23
TomatoesTransplant · Apr 13 – Apr 27
Peppers, eggplantStart indoors · Jan 26 – Feb 9
Peppers, eggplantTransplant · Apr 20 – May 4
BeansSow outdoors · Apr 13 – Apr 27
Sweet cornSow outdoors · Apr 13 – Apr 27
Cucumbers, squashSow outdoors · Apr 13 – Apr 27
Fall lettuce, spinachSow outdoors · Sep 3 – Sep 17
GarlicPlant cloves · Oct 15 – Nov 19
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 6) and first fall frost (Oct 29) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 37306 came on Feb 20 — about the same time as the 1991–2020 average (Feb 22).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Soil in Belvidere, TN

The soil mapped at the center of ZIP 37306 is Talbott — silty clay loam, well drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up
pH5.6moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Rockland, limestone, steep and very steep.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 37306; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Belvidere, TN

Summer high87 °Faverage high, July
Winter low30 °Faverage low, January
Hot days33days a year at 90 °F or more
Freezing nights71nights a year at 32 °F or less
Growing degree days4,548base 50 °F — the season’s usable heat
Longest day14 h 31 mindaylight on June 21
Shortest day9 h 47 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation59.6 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 49 °F, low 30 °F 49°30° JanFebruary: average high 53 °F, low 33 °F 53°33° FebMarch: average high 61 °F, low 40 °F 61°40° MarApril: average high 71 °F, low 47 °F 71°47° AprMay: average high 78 °F, low 56 °F 78°56° MayJune: average high 85 °F, low 64 °F 85°64° JunJuly: average high 87 °F, low 68 °F 87°68° JulAugust: average high 87 °F, low 66 °F 87°66° AugSeptember: average high 82 °F, low 60 °F 82°60° SepOctober: average high 72 °F, low 49 °F 72°49° OctNovember: average high 61 °F, low 38 °F 61°38° NovDecember: average high 52 °F, low 33 °F 52°33° Dec

Precipitation by month inches

0″2″4″6″January: 5.19 in precipitation 5.2 JanFebruary: 5.26 in precipitation 5.3 FebMarch: 6.06 in precipitation 6.1 MarApril: 5.46 in precipitation 5.5 AprMay: 4.69 in precipitation 4.7 MayJune: 5.65 in precipitation 5.7 JunJuly: 4.73 in precipitation 4.7 JulAugust: 4.22 in precipitation 4.2 AugSeptember: 4.14 in precipitation 4.1 SepOctober: 3.69 in precipitation 3.7 OctNovember: 4.46 in precipitation 4.5 NovDecember: 6.08 in precipitation 6.1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Winchester 5se, TN (10 mi away); precipitation: Winchester 1.6 W, TN (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

373457b
Huntland, TN · 6 mi
373987b
Winchester, TN · 7 mi
373287b
Elora, TN · 10 mi
357457b
Estillfork, AL · 11 mi
373357b
Flintville, TN · 12 mi
373307b
Estill Springs, TN · 13 mi
373187b
Cowan, TN · 13 mi
373487b
Kelso, TN · 14 mi

Tennessee planting zones →

Questions about 37306

What planting zone is ZIP code 37306?

ZIP code 37306 (Belvidere, TN) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Belvidere, TN?

The median last spring frost (32 °F) near 37306 is April 6; after April 25 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Winchester 5se station.

When is the first frost in Belvidere, TN?

The median first fall frost near 37306 is October 29, giving a median frost-free growing season of 204 days.

When should I plant tomatoes in 37306?

Start tomato seeds indoors around Feb 9 – Feb 23 and set transplants outside around Apr 13 – Apr 27, one to three weeks after the median last frost.

How much rain and snow does 37306 get?

About 59.6 inches of precipitation a year (NOAA 1991–2020 normals, Winchester 1.6 W station).

How hot do summers get in Belvidere, TN?

The average high peaks at 87 °F in July, with about 33 days a year at 90 °F or more.

What kind of soil does 37306 have?

The USDA soil survey maps Talbott at the center of ZIP 37306: silty clay loam, well drained, pH about 5.6 (moderately acidic).

Did spring come early in Belvidere, TN in 2026?

Spring leaf-out near 37306 came on Feb 20 in 2026, about the same as the 1991–2020 average (Feb 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Belvidere, TN?

Intermediate onions: the longest day near 37306 is 14 h 31 min, so day-neutral types bulb best; long-day varieties may not bulb fully.