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

Planting zone for 37691 — Trade, TN

ZIP code 37691 (Trade, Johnson County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 27 and the first fall frost October 14.

Where ZIP 37691 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.

Zone7a0 to 5 °F
Coldest night−17.8 to −15 °C
Last frostApr 27
First frostOct 14
2012 zone6a

Was 6a on the 2012 map — a full zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Trade, 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 Trade, TN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 27median — 50% chance of a later frost
Safe for tender plantsMay 15only 10% chance of frost after
First fall frostOctober 14median — 10% chance by Oct 3
Growing season170 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 12 and returns around October 24.

From the NOAA station Mtn City 2, TN — 8 miles away, elevation 2,418 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 37691

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 16 – Mar 30
SpinachSow outdoors · Mar 16 – Apr 6
Broccoli, cabbageStart indoors · Feb 16 – Mar 2
Broccoli, cabbageTransplant · Apr 6 – Apr 20
Onion setsPlant outdoors · Mar 30 – Apr 13
PotatoesPlant outdoors · Apr 6 – Apr 20
LettuceSow outdoors · Mar 30 – Apr 13
Carrots, beetsSow outdoors · Apr 6 – Apr 20
TomatoesStart indoors · Mar 2 – Mar 16
TomatoesTransplant · May 4 – May 18
Peppers, eggplantStart indoors · Feb 16 – Mar 2
Peppers, eggplantTransplant · May 11 – May 25
BeansSow outdoors · May 4 – May 18
Sweet cornSow outdoors · May 4 – May 18
Cucumbers, squashSow outdoors · May 4 – May 18
Fall lettuce, spinachSow outdoors · Aug 19 – Sep 2
GarlicPlant cloves · Sep 30 – Nov 4
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 27) and first fall frost (Oct 14) 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 37691 came on Mar 7 — 9 days earlier than the 1991–2020 average (Mar 16).

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 Trade, TN

The soil mapped at the center of ZIP 37691 is Hatboro — loam, poorly drained.

TextureLoama good balance for most vegetables
pH5.9moderately acidic; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter3%moderate
Hydrologic groupB/Dmoderate when drained; wet otherwise
Farmland classPrime farmland if drainedUSDA classification

Map unit: Hatboro loam, occasionally flooded.

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 37691; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Trade, TN

Summer high82 °Faverage high, July
Winter low23 °Faverage low, January
Hot days3days a year at 90 °F or more
Freezing nights126nights a year at 32 °F or less
Growing degree days3,119base 50 °F — the season’s usable heat
Longest day14 h 39 mindaylight on June 21
Shortest day9 h 41 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation47.2 inper year, rain and melted snow
Snowfall12 inper year

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 46 °F, low 23 °F 46°23° JanFebruary: average high 49 °F, low 25 °F 49°25° FebMarch: average high 57 °F, low 31 °F 57°31° MarApril: average high 67 °F, low 39 °F 67°39° AprMay: average high 74 °F, low 49 °F 74°49° MayJune: average high 80 °F, low 56 °F 80°56° JunJuly: average high 82 °F, low 60 °F 82°60° JulAugust: average high 81 °F, low 59 °F 81°59° AugSeptember: average high 77 °F, low 53 °F 77°53° SepOctober: average high 68 °F, low 41 °F 68°41° OctNovember: average high 58 °F, low 31 °F 58°31° NovDecember: average high 49 °F, low 26 °F 49°26° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.74 in precipitation, 3.4 in snowfall 3.7❄3 JanFebruary: 3.36 in precipitation, 5 in snowfall 3.4❄5 FebMarch: 4.09 in precipitation, 1.1 in snowfall 4.1❄1 MarApril: 4.33 in precipitation, 0.1 in snowfall 4.3 AprMay: 5.15 in precipitation 5.2 MayJune: 4.48 in precipitation 4.5 JunJuly: 5.03 in precipitation 5.0 JulAugust: 4.16 in precipitation 4.2 AugSeptember: 3.26 in precipitation 3.3 SepOctober: 2.81 in precipitation 2.8 OctNovember: 2.89 in precipitation, 0.4 in snowfall 2.9 NovDecember: 3.89 in precipitation, 2 in snowfall 3.9❄2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Mtn City 2, TN (8 mi away); precipitation: Mtn City 2, TN (8 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

286987a
Zionville, NC · 4 mi
286927a
Vilas, NC · 6 mi
376837a
Mountain City, TN · 7 mi
286847a
Todd, NC · 9 mi
286157a
Creston, NC · 9 mi
286797a
Sugar Grove, NC · 9 mi
286917a
Valle Crucis, NC · 11 mi
286077a
Boone, NC · 12 mi

Tennessee planting zones →

Questions about 37691

What planting zone is ZIP code 37691?

ZIP code 37691 (Trade, TN) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Trade, TN?

The median last spring frost (32 °F) near 37691 is April 27; after May 15 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mtn City 2 station.

When is the first frost in Trade, TN?

The median first fall frost near 37691 is October 14, giving a median frost-free growing season of 170 days.

When should I plant tomatoes in 37691?

Start tomato seeds indoors around Mar 2 – Mar 16 and set transplants outside around May 4 – May 18, one to three weeks after the median last frost.

How much rain and snow does 37691 get?

About 47.2 inches of precipitation a year and 12 inches of snowfall (NOAA 1991–2020 normals, Mtn City 2 station).

How hot do summers get in Trade, TN?

The average high peaks at 82 °F in July, with about 3 days a year at 90 °F or more.

What kind of soil does 37691 have?

The USDA soil survey maps Hatboro at the center of ZIP 37691: loam, poorly drained, pH about 5.9 (moderately acidic).

Did spring come early in Trade, TN in 2026?

Spring leaf-out near 37691 came on Mar 7 in 2026, 9 days earlier than the 1991–2020 average (Mar 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Trade, TN?

Intermediate onions: the longest day near 37691 is 14 h 39 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 37691 change?

Yes. The 2012 USDA map put 37691 in zone 6a; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.