Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 37074 — Hartsville, TN

ZIP code 37074 (Hartsville, Trousdale County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 12 and the first fall frost October 26.

Where ZIP 37074 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 12

First frostOct 26

2012 zone7a

Was 7a on the 2012 map — half a zone warmer now. 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 Hartsville, 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 Hartsville, TN

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostApril 12median — 50% chance of a later frost

Safe for tender plantsApril 29only 10% chance of frost after

First fall frostOctober 26median — 10% chance by Oct 13

Growing season196 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 31 and returns around November 4.

From the NOAA station Hartsville, TN — 4 miles away, elevation 512 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 37074

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 1 – Mar 15

SpinachSow outdoors · Mar 1 – Mar 22

Broccoli, cabbageStart indoors · Feb 1 – Feb 15

Broccoli, cabbageTransplant · Mar 22 – Apr 5

Onion setsPlant outdoors · Mar 15 – Mar 29

PotatoesPlant outdoors · Mar 22 – Apr 5

LettuceSow outdoors · Mar 15 – Mar 29

Carrots, beetsSow outdoors · Mar 22 – Apr 5

TomatoesStart indoors · Feb 15 – Mar 1

TomatoesTransplant · Apr 19 – May 3

Peppers, eggplantStart indoors · Feb 1 – Feb 15

Peppers, eggplantTransplant · Apr 26 – May 10

BeansSow outdoors · Apr 19 – May 3

Sweet cornSow outdoors · Apr 19 – May 3

Cucumbers, squashSow outdoors · Apr 19 – May 3

Fall lettuce, spinachSow outdoors · Aug 31 – Sep 14

GarlicPlant cloves · Oct 12 – Nov 16

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 12) and first fall frost (Oct 26) 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 37074 came on Feb 25 — about the same time as the 1991–2020 average (Feb 27).

average
Feb 272026
Feb 25

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).

Native plants for zone 7b in Tennessee

566 plants native to the lower 48 states, recorded in Tennessee, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. Each links to its USDA PLANTS profile.

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Hartsville, TN.

Soil in Hartsville, TN

The soil mapped at the center of ZIP 37074 is Barfield — silty clay loam, well drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up

pH6.7neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter5%high

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Barfield-Ashwood-Rock outcrop complex, 20 to 50 percent slopes.

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 37074; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Hartsville, TN

Summer high88 °Faverage high, July

Winter low27 °Faverage low, January

Hot days41days a year at 90 °F or more

Freezing nights82nights a year at 32 °F or less

Growing degree days4,291base 50 °F — the season’s usable heat

Longest day14 h 39 mindaylight on June 21

Shortest day9 h 40 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation55 inper year, rain and melted snow

Snowfall5 inper year; 4 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hartsville, TN (4 mi away); precipitation: Bethpage 1 S, TN (10 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

370577b

Dixon Springs, TN · 7 mi

370317b

Castalian Springs, TN · 9 mi

371517b

Riddleton, TN · 10 mi

370227b

Bethpage, TN · 11 mi

370837b

Lafayette, TN · 11 mi

371867b

Westmoreland, TN · 12 mi

370877b

Lebanon, TN · 13 mi

371457b

Pleasant Shade, TN · 13 mi

Tennessee planting zones →

Questions about 37074

What planting zone is ZIP code 37074?

ZIP code 37074 (Hartsville, 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 Hartsville, TN?

The median last spring frost (32 °F) near 37074 is April 12; after April 29 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Hartsville station.

When is the first frost in Hartsville, TN?

The median first fall frost near 37074 is October 26, giving a median frost-free growing season of 196 days.

When should I plant tomatoes in 37074?

Start tomato seeds indoors around Feb 15 – Mar 1 and set transplants outside around Apr 19 – May 3, one to three weeks after the median last frost.

How much rain and snow does 37074 get?

About 55 inches of precipitation a year and 5 inches of snowfall (NOAA 1991–2020 normals, Bethpage 1 S station).

How hot do summers get in Hartsville, TN?

The average high peaks at 88 °F in July, with about 41 days a year at 90 °F or more.

What kind of soil does 37074 have?

The USDA soil survey maps Barfield at the center of ZIP 37074: silty clay loam, well drained, pH about 6.7 (neutral).

Did spring come early in Hartsville, TN in 2026?

Spring leaf-out near 37074 came on Feb 25 in 2026, about the same as the 1991–2020 average (Feb 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Hartsville, TN?

Intermediate onions: the longest day near 37074 is 14 h 39 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 37074 change?

Yes. The 2012 USDA map put 37074 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.