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

Planting zone for 37389 — Arnold Afb, TN

ZIP code 37389 (Arnold Afb, Coffee County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 13 and the first fall frost October 24.

Where ZIP 37389 is

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 13
First frostOct 24
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 Arnold Afb, 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 Arnold Afb, TN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 13median — 50% chance of a later frost
Safe for tender plantsApril 30only 10% chance of frost after
First fall frostOctober 24median — 10% chance by Oct 11
Growing season192 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 1 and returns around November 1.

From the NOAA station Manchester #2, TN — within 1 mile, elevation 1,070 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 37389

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 2 – Mar 16
SpinachSow outdoors · Mar 2 – Mar 23
Broccoli, cabbageStart indoors · Feb 2 – Feb 16
Broccoli, cabbageTransplant · Mar 23 – Apr 6
Onion setsPlant outdoors · Mar 16 – Mar 30
PotatoesPlant outdoors · Mar 23 – Apr 6
LettuceSow outdoors · Mar 16 – Mar 30
Carrots, beetsSow outdoors · Mar 23 – Apr 6
TomatoesStart indoors · Feb 16 – Mar 2
TomatoesTransplant · Apr 20 – May 4
Peppers, eggplantStart indoors · Feb 2 – Feb 16
Peppers, eggplantTransplant · Apr 27 – May 11
BeansSow outdoors · Apr 20 – May 4
Sweet cornSow outdoors · Apr 20 – May 4
Cucumbers, squashSow outdoors · Apr 20 – May 4
Fall lettuce, spinachSow outdoors · Aug 29 – Sep 12
GarlicPlant cloves · Oct 10 – Nov 14
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 13) and first fall frost (Oct 24) 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 37389 came on Feb 21 — 3 days earlier than the 1991–2020 average (Feb 24).

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.

Trees 82

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 116

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican beautyberry6 ft · blooms early summer · medium shade tolerance · to −8 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °F

Wildflowers & perennials 184

American bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °FAmerican speedwell0.8 ft · blooms mid summer · low shade tolerance · to −38 °FAmerican spongeplant0.5 ft · blooms mid spring · high shade tolerance · to −24 °F

Grasses 157

American cupscale3 ft · blooms early summer · high shade tolerance · to −18 °Fautumn bluegrass1.5 ft · blooms late spring · medium shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °Fbluejoint5 ft · blooms late spring · high shade tolerance · to −33 °F

Vines 14

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fcupseed30 ft · blooms late spring · low shade tolerance · to −3 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °F

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 Arnold Afb, TN.

Soil in Arnold Afb, TN

The soil mapped at the center of ZIP 37389 is Lawrence — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables
pH5.5moderately acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter2%moderate
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classprime farmlandUSDA classification

Map unit: Lawrence silt loam.

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 37389; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Arnold Afb, TN

Summer high86 °Faverage high, July
Winter low26 °Faverage low, January
Hot days23days a year at 90 °F or more
Freezing nights94nights a year at 32 °F or less
Growing degree days3,959base 50 °F — the season’s usable heat
Longest day14 h 34 mindaylight on June 21
Shortest day9 h 45 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation59.3 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 47 °F, low 26 °F 47°26° JanFebruary: average high 51 °F, low 29 °F 51°29° FebMarch: average high 60 °F, low 35 °F 60°35° MarApril: average high 69 °F, low 43 °F 69°43° AprMay: average high 76 °F, low 53 °F 76°53° MayJune: average high 84 °F, low 61 °F 84°61° JunJuly: average high 86 °F, low 65 °F 86°65° JulAugust: average high 86 °F, low 63 °F 86°63° AugSeptember: average high 80 °F, low 57 °F 80°57° SepOctober: average high 71 °F, low 44 °F 71°44° OctNovember: average high 59 °F, low 34 °F 59°34° NovDecember: average high 51 °F, low 30 °F 51°30° Dec

Precipitation by month inches

0″2″4″6″January: 5.37 in precipitation 5.4 JanFebruary: 5.46 in precipitation 5.5 FebMarch: 6.36 in precipitation 6.4 MarApril: 5.85 in precipitation 5.8 AprMay: 4.33 in precipitation 4.3 MayJune: 5.06 in precipitation 5.1 JunJuly: 4.90 in precipitation 4.9 JulAugust: 3.67 in precipitation 3.7 AugSeptember: 4.24 in precipitation 4.2 SepOctober: 3.46 in precipitation 3.5 OctNovember: 4.01 in precipitation 4.0 NovDecember: 6.56 in precipitation 6.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Manchester #2, TN (within 1 mile); precipitation: Manchester #2, TN (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

373497b
Manchester, TN · <1 mi
373557b
Manchester, TN · <1 mi
373827b
Summitville, TN · 6 mi
373427b
Hillsboro, TN · 11 mi
373607b
Normandy, TN · 11 mi
373577b
Morrison, TN · 11 mi
371837b
Wartrace, TN · 12 mi
370187b
Beechgrove, TN · 12 mi

Tennessee planting zones →

Questions about 37389

What planting zone is ZIP code 37389?

ZIP code 37389 (Arnold Afb, 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 Arnold Afb, TN?

The median last spring frost (32 °F) near 37389 is April 13; after April 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Manchester #2 station.

When is the first frost in Arnold Afb, TN?

The median first fall frost near 37389 is October 24, giving a median frost-free growing season of 192 days.

When should I plant tomatoes in 37389?

Start tomato seeds indoors around Feb 16 – Mar 2 and set transplants outside around Apr 20 – May 4, one to three weeks after the median last frost.

How much rain and snow does 37389 get?

About 59.3 inches of precipitation a year (NOAA 1991–2020 normals, Manchester #2 station).

How hot do summers get in Arnold Afb, TN?

The average high peaks at 86 °F in July, with about 23 days a year at 90 °F or more.

What kind of soil does 37389 have?

The USDA soil survey maps Lawrence at the center of ZIP 37389: silt loam, somewhat poorly drained, pH about 5.5 (moderately acidic).

Did spring come early in Arnold Afb, TN in 2026?

Spring leaf-out near 37389 came on Feb 21 in 2026, 3 days earlier than the 1991–2020 average (Feb 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Arnold Afb, TN?

Intermediate onions: the longest day near 37389 is 14 h 34 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 37389 change?

Yes. The 2012 USDA map put 37389 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.