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

Planting zone for 29370 — Mountville, SC

ZIP code 29370 (Mountville, Laurens County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 29 and the first fall frost November 4.

Where ZIP 29370 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.

Zone8a10 to 15 °F
Coldest night−12.2 to −9.4 °C
Last frostMar 29
First frostNov 4
2012 zone7b

Was 7b 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 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Mountville, SC…

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 Mountville, SC

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 29median — 50% chance of a later frost
Safe for tender plantsApril 13only 10% chance of frost after
First fall frostNovember 4median — 10% chance by Oct 21
Growing season219 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 18 and returns around November 17.

From the NOAA station Clinton, SC — 9 miles away, elevation 656 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 29370

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 15 – Mar 1
SpinachSow outdoors · Feb 15 – Mar 8
Broccoli, cabbageStart indoors · Jan 18 – Feb 1
Broccoli, cabbageTransplant · Mar 8 – Mar 22
Onion setsPlant outdoors · Mar 1 – Mar 15
PotatoesPlant outdoors · Mar 8 – Mar 22
LettuceSow outdoors · Mar 1 – Mar 15
Carrots, beetsSow outdoors · Mar 8 – Mar 22
TomatoesStart indoors · Feb 1 – Feb 15
TomatoesTransplant · Apr 5 – Apr 19
Peppers, eggplantStart indoors · Jan 18 – Feb 1
Peppers, eggplantTransplant · Apr 12 – Apr 26
BeansSow outdoors · Apr 5 – Apr 19
Sweet cornSow outdoors · Apr 5 – Apr 19
Cucumbers, squashSow outdoors · Apr 5 – Apr 19
Fall lettuce, spinachSow outdoors · Sep 9 – Sep 23
GarlicPlant cloves · Oct 21 – Nov 25
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 29) and first fall frost (Nov 4) 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 29370 came on Feb 18 — 6 days later than the 1991–2020 average (Feb 12).

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 Mountville, SC

The soil mapped at the center of ZIP 29370 is Cecil — sandy clay loam, well drained.

TextureSandy clay loamholds water and nutrients; slow to drain and warm up
pH5.2strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.5%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Cecil sandy clay loam, 6 to 10 percent slopes, moderately 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 29370; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Mountville, SC

Summer high91 °Faverage high, July
Winter low32 °Faverage low, January
Hot days65days a year at 90 °F or more
Freezing nights59nights a year at 32 °F or less
Growing degree days5,104base 50 °F — the season’s usable heat
Longest day14 h 27 mindaylight on June 21
Shortest day9 h 51 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation46.4 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 54 °F, low 32 °F 54°32° JanFebruary: average high 59 °F, low 34 °F 59°34° FebMarch: average high 66 °F, low 40 °F 66°40° MarApril: average high 75 °F, low 48 °F 75°48° AprMay: average high 82 °F, low 57 °F 82°57° MayJune: average high 88 °F, low 66 °F 88°66° JunJuly: average high 91 °F, low 69 °F 91°69° JulAugust: average high 89 °F, low 68 °F 89°68° AugSeptember: average high 84 °F, low 63 °F 84°63° SepOctober: average high 75 °F, low 50 °F 75°50° OctNovember: average high 65 °F, low 39 °F 65°39° NovDecember: average high 57 °F, low 33 °F 57°33° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 4.08 in precipitation 4.1 JanFebruary: 3.70 in precipitation 3.7 FebMarch: 4.39 in precipitation 4.4 MarApril: 3.43 in precipitation 3.4 AprMay: 3.49 in precipitation 3.5 MayJune: 4.09 in precipitation 4.1 JunJuly: 4.05 in precipitation 4.0 JulAugust: 4.05 in precipitation 4.0 AugSeptember: 3.65 in precipitation 3.6 SepOctober: 3.42 in precipitation 3.4 OctNovember: 3.66 in precipitation 3.7 NovDecember: 4.39 in precipitation 4.4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Clinton, SC (9 mi away); precipitation: Clinton, SC (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8a.

293328a
Cross Hill, SC · 7 mi
293848a
Waterloo, SC · 7 mi
293608a
Laurens, SC · 9 mi
293258a
Clinton, SC · 10 mi
293518a
Joanna, SC · 10 mi
293558a
Kinards, SC · 13 mi
296498a
Greenwood, SC · 13 mi
296928a
Ware Shoals, SC · 14 mi

South Carolina planting zones →

Questions about 29370

What planting zone is ZIP code 29370?

ZIP code 29370 (Mountville, SC) is in USDA hardiness zone 8a on the 2023 map: the coldest night of an average winter reaches 10 to 15 °F (−12.2 to −9.4 °C).

When is the last frost in Mountville, SC?

The median last spring frost (32 °F) near 29370 is March 29; after April 13 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Clinton station.

When is the first frost in Mountville, SC?

The median first fall frost near 29370 is November 4, giving a median frost-free growing season of 219 days.

When should I plant tomatoes in 29370?

Start tomato seeds indoors around Feb 1 – Feb 15 and set transplants outside around Apr 5 – Apr 19, one to three weeks after the median last frost.

How much rain and snow does 29370 get?

About 46.4 inches of precipitation a year (NOAA 1991–2020 normals, Clinton station).

How hot do summers get in Mountville, SC?

The average high peaks at 91 °F in July, with about 65 days a year at 90 °F or more.

What kind of soil does 29370 have?

The USDA soil survey maps Cecil at the center of ZIP 29370: sandy clay loam, well drained, pH about 5.2 (strongly acidic).

Did spring come early in Mountville, SC in 2026?

Spring leaf-out near 29370 came on Feb 18 in 2026, 6 days later than the 1991–2020 average (Feb 12), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Mountville, SC?

Intermediate onions: the longest day near 29370 is 14 h 27 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 29370 change?

Yes. The 2012 USDA map put 29370 in zone 7b; the 2023 map puts it in zone 8a. The newer map uses 1991–2020 data and more weather stations.