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

Planting zone for 39649 — Mccomb, MS

ZIP code 39649 (Mccomb, Pike County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 11 and the first fall frost November 18.

Where ZIP 39649 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.

Zone8b15 to 20 °F

Coldest night−9.4 to −6.7 °C

Last frostMar 11

First frostNov 18

2012 zone8b

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Mccomb, MS…

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 Mccomb, MS

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 11median — 50% chance of a later frost

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

First fall frostNovember 18median — 10% chance by Nov 1

Growing season253 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 25 and returns around December 1.

From the NOAA station Mccomb/Pike Co./John E Lewis Airport, MS — 4 miles away, elevation 413 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 39649

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Jan 28 – Feb 11

SpinachSow outdoors · Jan 28 – Feb 18

Broccoli, cabbageStart indoors · Dec 31 – Jan 14

Broccoli, cabbageTransplant · Feb 18 – Mar 4

Onion setsPlant outdoors · Feb 11 – Feb 25

PotatoesPlant outdoors · Feb 18 – Mar 4

LettuceSow outdoors · Feb 11 – Feb 25

Carrots, beetsSow outdoors · Feb 18 – Mar 4

TomatoesStart indoors · Jan 14 – Jan 28

TomatoesTransplant · Mar 18 – Apr 1

Peppers, eggplantStart indoors · Dec 31 – Jan 14

Peppers, eggplantTransplant · Mar 25 – Apr 8

BeansSow outdoors · Mar 18 – Apr 1

Sweet cornSow outdoors · Mar 18 – Apr 1

Cucumbers, squashSow outdoors · Mar 18 – Apr 1

Fall lettuce, spinachSow outdoors · Sep 23 – Oct 7

GarlicPlant cloves · Nov 4 – Dec 9

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 11) and first fall frost (Nov 18) 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 39649 came on Jan 21 — 9 days earlier than the 1991–2020 average (Jan 30).

average
Jan 302026
Jan 21

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 8b in Mississippi

526 plants native to the lower 48 states, recorded in Mississippi, and rated by the USDA to survive 15 °F or colder — the bottom of zone 8b. 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 Mccomb, MS.

Soil in Mccomb, MS

The soil mapped at the center of ZIP 39649 is Brookhaven — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables

pH5.3strongly acidic; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter1.25%low — add compost

Hydrologic groupC/Dslow when drained; wet otherwise

Farmland classprime farmlandUSDA classification

Map unit: Brookhaven silt loam, 2 to 5 percent slopes, eroded (bude).

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 39649; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Mccomb, MS

Summer high91 °Faverage high, July

Winter low38 °Faverage low, January

Hot days84days a year at 90 °F or more

Freezing nights30nights a year at 32 °F or less

Growing degree days6,290base 50 °F — the season’s usable heat

Longest day14 h 11 mindaylight on June 21

Shortest day10 h 07 mindaylight on December 21

Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb

Precipitation60.6 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: Mccomb/Pike Co./John E Lewis Airport, MS (4 mi away); precipitation: Mccomb/Pike Co./John E Lewis Airport, MS (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8b.

Bogue Chitto, MS · 13 mi

396628b

Ruth, MS · 14 mi

396648b

Smithdale, MS · 14 mi

All 2 ZIP codes in Mccomb → · Mississippi planting zones →

Questions about 39649

What planting zone is ZIP code 39649?

ZIP code 39649 (Mccomb, MS) is in USDA hardiness zone 8b on the 2023 map: the coldest night of an average winter reaches 15 to 20 °F (−9.4 to −6.7 °C).

When is the last frost in Mccomb, MS?

The median last spring frost (32 °F) near 39649 is March 11; after April 2 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mccomb/Pike Co./John E Lewis Airport station.

When is the first frost in Mccomb, MS?

The median first fall frost near 39649 is November 18, giving a median frost-free growing season of 253 days.

When should I plant tomatoes in 39649?

Start tomato seeds indoors around Jan 14 – Jan 28 and set transplants outside around Mar 18 – Apr 1, one to three weeks after the median last frost.

How much rain and snow does 39649 get?

About 60.6 inches of precipitation a year (NOAA 1991–2020 normals, Mccomb/Pike Co./John E Lewis Airport station).

How hot do summers get in Mccomb, MS?

The average high peaks at 91 °F in July, with about 84 days a year at 90 °F or more.

What kind of soil does 39649 have?

The USDA soil survey maps Brookhaven at the center of ZIP 39649: silt loam, moderately well drained, pH about 5.3 (strongly acidic).

Did spring come early in Mccomb, MS in 2026?

Spring leaf-out near 39649 came on Jan 21 in 2026, 9 days earlier than the 1991–2020 average (Jan 30), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Mccomb, MS?

Short-day onions: the longest day near 39649 is 14 h 11 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.