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

Planting zone for 37150 — Red Boiling Springs, TN

ZIP code 37150 (Red Boiling Springs, Macon County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 3 and the first fall frost November 1.

Where ZIP 37150 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 3
First frostNov 1
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 Red Boiling Springs, 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 Red Boiling Springs, TN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 3median — 50% chance of a later frost
Safe for tender plantsApril 21only 10% chance of frost after
First fall frostNovember 1median — 10% chance by Oct 20
Growing season213 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 23 and returns around November 11.

From the NOAA station Lafayette, TN — 12 miles away, elevation 974 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 37150

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 20 – Mar 6
SpinachSow outdoors · Feb 20 – Mar 13
Broccoli, cabbageStart indoors · Jan 23 – Feb 6
Broccoli, cabbageTransplant · Mar 13 – Mar 27
Onion setsPlant outdoors · Mar 6 – Mar 20
PotatoesPlant outdoors · Mar 13 – Mar 27
LettuceSow outdoors · Mar 6 – Mar 20
Carrots, beetsSow outdoors · Mar 13 – Mar 27
TomatoesStart indoors · Feb 6 – Feb 20
TomatoesTransplant · Apr 10 – Apr 24
Peppers, eggplantStart indoors · Jan 23 – Feb 6
Peppers, eggplantTransplant · Apr 17 – May 1
BeansSow outdoors · Apr 10 – Apr 24
Sweet cornSow outdoors · Apr 10 – Apr 24
Cucumbers, squashSow outdoors · Apr 10 – Apr 24
Fall lettuce, spinachSow outdoors · Sep 6 – Sep 20
GarlicPlant cloves · Oct 18 – Nov 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 3) and first fall frost (Nov 1) 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 37150 came on Feb 25 — 3 days earlier than the 1991–2020 average (Feb 28).

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 Red Boiling Springs, TN

The soil mapped at the center of ZIP 37150 is Sugargrove — gravelly silt loam, well drained.

TextureGravelly silt loama good balance for most vegetables
pH5.0strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.8%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Sugargrove gravelly silt loam, 5 to 12 percent slopes, eroded.

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 37150; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Red Boiling Springs, TN

Summer high88 °Faverage high, July
Winter low27 °Faverage low, January
Hot days48days a year at 90 °F or more
Freezing nights75nights a year at 32 °F or less
Growing degree days4,542base 50 °F — the season’s usable heat
Longest day14 h 40 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

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 45 °F, low 27 °F 45°27° JanFebruary: average high 50 °F, low 31 °F 50°31° FebMarch: average high 59 °F, low 39 °F 59°39° MarApril: average high 70 °F, low 48 °F 70°48° AprMay: average high 78 °F, low 56 °F 78°56° MayJune: average high 85 °F, low 65 °F 85°65° JunJuly: average high 88 °F, low 69 °F 88°69° JulAugust: average high 88 °F, low 67 °F 88°67° AugSeptember: average high 82 °F, low 60 °F 82°60° SepOctober: average high 71 °F, low 48 °F 71°48° OctNovember: average high 59 °F, low 38 °F 59°38° NovDecember: average high 49 °F, low 31 °F 49°31° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 4.40 in precipitation 4.4 JanFebruary: 4.66 in precipitation 4.7 FebMarch: 5.04 in precipitation 5.0 MarApril: 5.06 in precipitation 5.1 AprMay: 5.26 in precipitation 5.3 MayJune: 4.74 in precipitation 4.7 JunJuly: 5.46 in precipitation 5.5 JulAugust: 3.93 in precipitation 3.9 AugSeptember: 3.68 in precipitation 3.7 SepOctober: 3.67 in precipitation 3.7 OctNovember: 3.94 in precipitation 3.9 NovDecember: 5.20 in precipitation 5.2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Lafayette, TN (12 mi away); precipitation: Red Boiling Springs 6.7 Nne, TN (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

385887a
Whitleyville, TN · 8 mi
421407a
Gamaliel, KY · 8 mi
385757a
Moss, TN · 10 mi
370837b
Lafayette, TN · 11 mi
371457b
Pleasant Shade, TN · 13 mi
421677a
Tompkinsville, KY · 14 mi
370577b
Dixon Springs, TN · 15 mi
421337a
Fountain Run, KY · 15 mi

Tennessee planting zones →

Questions about 37150

What planting zone is ZIP code 37150?

ZIP code 37150 (Red Boiling Springs, 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 Red Boiling Springs, TN?

The median last spring frost (32 °F) near 37150 is April 3; after April 21 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Lafayette station.

When is the first frost in Red Boiling Springs, TN?

The median first fall frost near 37150 is November 1, giving a median frost-free growing season of 213 days.

When should I plant tomatoes in 37150?

Start tomato seeds indoors around Feb 6 – Feb 20 and set transplants outside around Apr 10 – Apr 24, one to three weeks after the median last frost.

How much rain and snow does 37150 get?

About 55 inches of precipitation a year (NOAA 1991–2020 normals, Red Boiling Springs 6.7 Nne station).

How hot do summers get in Red Boiling Springs, TN?

The average high peaks at 88 °F in July, with about 48 days a year at 90 °F or more.

What kind of soil does 37150 have?

The USDA soil survey maps Sugargrove at the center of ZIP 37150: gravelly silt loam, well drained, pH about 5.0 (strongly acidic).

Did spring come early in Red Boiling Springs, TN in 2026?

Spring leaf-out near 37150 came on Feb 25 in 2026, 3 days earlier than the 1991–2020 average (Feb 28), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Red Boiling Springs, TN?

Intermediate onions: the longest day near 37150 is 14 h 40 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 37150 change?

Yes. The 2012 USDA map put 37150 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.