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

Planting zone for 39664 — Smithdale, MS

ZIP code 39664 (Smithdale, Amite County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 25 and the first fall frost November 8.

Where ZIP 39664 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.

Zone8b15 to 20 °F

Coldest night−9.4 to −6.7 °C

Last frostMar 25

First frostNov 8

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 Smithdale, 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 Smithdale, MS

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 25median — 50% chance of a later frost

Safe for tender plantsApril 15only 10% chance of frost after

First fall frostNovember 8median — 10% chance by Oct 25

Growing season230 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 6 and returns around November 20.

From the NOAA station Liberty, MS — 14 miles away, elevation 328 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 39664

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 11 – Feb 25

SpinachSow outdoors · Feb 11 – Mar 4

Broccoli, cabbageStart indoors · Jan 14 – Jan 28

Broccoli, cabbageTransplant · Mar 4 – Mar 18

Onion setsPlant outdoors · Feb 25 – Mar 11

PotatoesPlant outdoors · Mar 4 – Mar 18

LettuceSow outdoors · Feb 25 – Mar 11

Carrots, beetsSow outdoors · Mar 4 – Mar 18

TomatoesStart indoors · Jan 28 – Feb 11

TomatoesTransplant · Apr 1 – Apr 15

Peppers, eggplantStart indoors · Jan 14 – Jan 28

Peppers, eggplantTransplant · Apr 8 – Apr 22

BeansSow outdoors · Apr 1 – Apr 15

Sweet cornSow outdoors · Apr 1 – Apr 15

Cucumbers, squashSow outdoors · Apr 1 – Apr 15

Fall lettuce, spinachSow outdoors · Sep 13 – Sep 27

GarlicPlant cloves · Oct 25 – Nov 29

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 25) and first fall frost (Nov 8) 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 39664 came on Jan 21 — 10 days earlier than the 1991–2020 average (Jan 31).

average
Jan 312026
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 Smithdale, MS.

Soil in Smithdale, MS

The soil mapped at the center of ZIP 39664 is Providence — 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 matter1.75%low — add compost

Hydrologic groupC/Dslow when drained; wet otherwise

Farmland classprime farmlandUSDA classification

Map unit: Providence silt loam, 2 to 5 percent slopes.

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 39664; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Smithdale, MS

Summer high92 °Faverage high, August

Winter low37 °Faverage low, January

Hot days75days a year at 90 °F or more

Freezing nights47nights a year at 32 °F or less

Growing degree days6,010base 50 °F — the season’s usable heat

Longest day14 h 11 mindaylight on June 21

Shortest day10 h 06 mindaylight on December 21

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

Precipitation65.9 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: Liberty, MS (14 mi away); precipitation: Liberty 6.4 Ene, MS (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8b.

Mc Call Creek, MS · 14 mi

Bogue Chitto, MS · 15 mi

396538b

Meadville, MS · 15 mi

396358b

Fernwood, MS · 17 mi

Mississippi planting zones →

Questions about 39664

What planting zone is ZIP code 39664?

ZIP code 39664 (Smithdale, 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 Smithdale, MS?

The median last spring frost (32 °F) near 39664 is March 25; after April 15 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Liberty station.

When is the first frost in Smithdale, MS?

The median first fall frost near 39664 is November 8, giving a median frost-free growing season of 230 days.

When should I plant tomatoes in 39664?

Start tomato seeds indoors around Jan 28 – Feb 11 and set transplants outside around Apr 1 – Apr 15, one to three weeks after the median last frost.

How much rain and snow does 39664 get?

About 65.9 inches of precipitation a year (NOAA 1991–2020 normals, Liberty 6.4 Ene station).

How hot do summers get in Smithdale, MS?

The average high peaks at 92 °F in August, with about 75 days a year at 90 °F or more.

What kind of soil does 39664 have?

The USDA soil survey maps Providence at the center of ZIP 39664: silt loam, moderately well drained, pH about 5.3 (strongly acidic).

Did spring come early in Smithdale, MS in 2026?

Spring leaf-out near 39664 came on Jan 21 in 2026, 10 days earlier than the 1991–2020 average (Jan 31), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Smithdale, MS?

Short-day onions: the longest day near 39664 is 14 h 11 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.