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

Planting zone for 37066 — Gallatin, TN

ZIP code 37066 (Gallatin, Sumner County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 16 and the first fall frost October 23.

Where ZIP 37066 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 16

First frostOct 23

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 Gallatin, 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 Gallatin, TN

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 16median — 50% chance of a later frost

Safe for tender plantsMay 2only 10% chance of frost after

First fall frostOctober 23median — 10% chance by Oct 10

Growing season189 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 3 and returns around October 31.

From the NOAA station Bethpage 1 S, TN — 9 miles away, elevation 561 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 37066

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 5 – Mar 19

SpinachSow outdoors · Mar 5 – Mar 26

Broccoli, cabbageStart indoors · Feb 5 – Feb 19

Broccoli, cabbageTransplant · Mar 26 – Apr 9

Onion setsPlant outdoors · Mar 19 – Apr 2

PotatoesPlant outdoors · Mar 26 – Apr 9

LettuceSow outdoors · Mar 19 – Apr 2

Carrots, beetsSow outdoors · Mar 26 – Apr 9

TomatoesStart indoors · Feb 19 – Mar 5

TomatoesTransplant · Apr 23 – May 7

Peppers, eggplantStart indoors · Feb 5 – Feb 19

Peppers, eggplantTransplant · Apr 30 – May 14

BeansSow outdoors · Apr 23 – May 7

Sweet cornSow outdoors · Apr 23 – May 7

Cucumbers, squashSow outdoors · Apr 23 – May 7

Fall lettuce, spinachSow outdoors · Aug 28 – Sep 11

GarlicPlant cloves · Oct 9 – Nov 13

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 16) and first fall frost (Oct 23) 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 37066 came on Feb 25 — 4 days earlier than the 1991–2020 average (Mar 1).

average
Mar 12026
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 Gallatin, TN.

Soil in Gallatin, TN

The soil mapped at the center of ZIP 37066 is Harpeth — silt loam, well drained.

TextureSilt loama good balance for most vegetables

pH5.6moderately acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2.5%moderate

Hydrologic groupBwater soaks in moderately

Farmland classNot prime farmlandUSDA classification

Map unit: Harpeth-Urban land complex, 2 to 8 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 37066; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Gallatin, TN

Summer high88 °Faverage high, July

Winter low25 °Faverage low, January

Hot days36days a year at 90 °F or more

Freezing nights101nights a year at 32 °F or less

Growing degree days4,093base 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

Precipitation53.5 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Bethpage 1 S, TN (9 mi away); precipitation: Gallatin 2w, TN (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

1 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

370317b

Castalian Springs, TN · 9 mi

370757b

Hendersonville, TN · 9 mi

370487b

Cottontown, TN · 10 mi

370227b

Bethpage, TN · 11 mi

370777b

Hendersonville, TN · 11 mi

371487b

Portland, TN · 13 mi

371887a

White House, TN · 14 mi

370877b

Lebanon, TN · 14 mi

Tennessee planting zones →

Questions about 37066

What planting zone is ZIP code 37066?

ZIP code 37066 (Gallatin, 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 Gallatin, TN?

The median last spring frost (32 °F) near 37066 is April 16; after May 2 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Bethpage 1 S station.

When is the first frost in Gallatin, TN?

The median first fall frost near 37066 is October 23, giving a median frost-free growing season of 189 days.

When should I plant tomatoes in 37066?

Start tomato seeds indoors around Feb 19 – Mar 5 and set transplants outside around Apr 23 – May 7, one to three weeks after the median last frost.

How much rain and snow does 37066 get?

About 53.5 inches of precipitation a year (NOAA 1991–2020 normals, Gallatin 2w station).

How hot do summers get in Gallatin, TN?

The average high peaks at 88 °F in July, with about 36 days a year at 90 °F or more.

What kind of soil does 37066 have?

The USDA soil survey maps Harpeth at the center of ZIP 37066: silt loam, well drained, pH about 5.6 (moderately acidic).

Did spring come early in Gallatin, TN in 2026?

Spring leaf-out near 37066 came on Feb 25 in 2026, 4 days earlier than the 1991–2020 average (Mar 1), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Gallatin, TN?

Intermediate onions: the longest day near 37066 is 14 h 39 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 37066 change?

Yes. The 2012 USDA map put 37066 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.