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

Planting zone for 70582 — Saint Martinville, LA

ZIP code 70582 (Saint Martinville, St. Martin County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is February 19 and the first fall frost December 1.

Where ZIP 70582 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.

Zone9a20 to 25 °F
Coldest night−6.7 to −3.9 °C
Last frostFeb 19
First frostDec 1
2012 zone9a

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 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Saint Martinville, LA…

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 Saint Martinville, LA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostFebruary 19median — 50% chance of a later frost
Safe for tender plantsMarch 16only 10% chance of frost after
First fall frostDecember 1median — 10% chance by Nov 9
Growing season289 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 30 and returns around December 19.

From the NOAA station Lafayette 13 Se, LA — 7 miles away, elevation 36 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 70582

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 8 – Jan 22
SpinachSow outdoors · Jan 8 – Jan 29
Broccoli, cabbageStart indoors · Dec 11 – Dec 25
Broccoli, cabbageTransplant · Jan 29 – Feb 12
Onion setsPlant outdoors · Jan 22 – Feb 5
PotatoesPlant outdoors · Jan 29 – Feb 12
LettuceSow outdoors · Jan 22 – Feb 5
Carrots, beetsSow outdoors · Jan 29 – Feb 12
TomatoesStart indoors · Dec 25 – Jan 8
TomatoesTransplant · Feb 26 – Mar 12
Peppers, eggplantStart indoors · Dec 11 – Dec 25
Peppers, eggplantTransplant · Mar 5 – Mar 19
BeansSow outdoors · Feb 26 – Mar 12
Sweet cornSow outdoors · Feb 26 – Mar 12
Cucumbers, squashSow outdoors · Feb 26 – Mar 12
Fall lettuce, spinachSow outdoors · Oct 6 – Oct 20
GarlicPlant cloves · Nov 17 – Dec 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 19) and first fall frost (Dec 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 70582 came on Jan 11 — 14 days earlier than the 1991–2020 average (Jan 25).

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 9a in Louisiana

517 plants native to the lower 48 states, recorded in Louisiana, and rated by the USDA to survive 20 °F or colder — the bottom of zone 9a. Each links to its USDA PLANTS profile.

Trees 69

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Fbald cypress130 ft · blooms mid spring · medium shade tolerance · to −18 °F

Shrubs 108

aloe yucca15 ft · blooms early summer · medium shade tolerance · to −1 °FAmerican beautyberry6 ft · blooms early summer · medium shade tolerance · to −8 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °FAmerican hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °F

Wildflowers & perennials 168

American bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican century plant6 ft · blooms indeterminate · high shade tolerance · to 12 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °FAmerican spongeplant0.5 ft · blooms mid spring · high shade tolerance · to −24 °F

Grasses 150

American cupscale3 ft · blooms early summer · high shade tolerance · to −18 °Fautumn bluegrass1.5 ft · blooms late spring · medium shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °Fbig cordgrass8 ft · blooms spring · high shade tolerance · to −3 °F

Vines 14

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fcupseed30 ft · blooms late spring · low shade tolerance · to −3 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °F

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 Saint Martinville, LA.

Soil in Saint Martinville, LA

The soil mapped at the center of ZIP 70582 is Gallion — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH6.5neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classprime farmlandUSDA classification

Map unit: Gallion-Perry complex, gently undulating.

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 70582; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Saint Martinville, LA

Summer high90 °Faverage high, July
Winter low43 °Faverage low, January
Hot days66days a year at 90 °F or more
Freezing nights14nights a year at 32 °F or less
Growing degree days6,755base 50 °F — the season’s usable heat
Longest day14 h 05 mindaylight on June 21
Shortest day10 h 12 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation66.5 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°32 °FJanuary: average high 62 °F, low 43 °F 62°43° JanFebruary: average high 65 °F, low 47 °F 65°47° FebMarch: average high 72 °F, low 52 °F 72°52° MarApril: average high 77 °F, low 57 °F 77°57° AprMay: average high 84 °F, low 65 °F 84°65° MayJune: average high 89 °F, low 71 °F 89°71° JunJuly: average high 90 °F, low 73 °F 90°73° JulAugust: average high 90 °F, low 73 °F 90°73° AugSeptember: average high 87 °F, low 68 °F 87°68° SepOctober: average high 80 °F, low 58 °F 80°58° OctNovember: average high 70 °F, low 48 °F 70°48° NovDecember: average high 64 °F, low 44 °F 64°44° Dec

Precipitation by month inches

0″2″4″6″8″January: 5.75 in precipitation 5.8 JanFebruary: 4.21 in precipitation 4.2 FebMarch: 3.96 in precipitation 4.0 MarApril: 5.25 in precipitation 5.3 AprMay: 5.70 in precipitation 5.7 MayJune: 7.42 in precipitation 7.4 JunJuly: 6.93 in precipitation 6.9 JulAugust: 6.52 in precipitation 6.5 AugSeptember: 5.47 in precipitation 5.5 SepOctober: 5.02 in precipitation 5.0 OctNovember: 5.45 in precipitation 5.5 NovDecember: 4.84 in precipitation 4.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Lafayette 13 Se, LA (7 mi away); precipitation: St. Martinville 0.2 S, LA (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

705179a
Breaux Bridge, LA · 9 mi
705189a
Broussard, LA · 9 mi
705639a
New Iberia, LA · 10 mi
705199a
Cade, LA · 10 mi
705529a
Loreauville, LA · 11 mi
705629b
New Iberia, LA · 11 mi
705219a
Cecilia, LA · 13 mi
705099a
Lafayette, LA · 13 mi

Louisiana planting zones →

Questions about 70582

What planting zone is ZIP code 70582?

ZIP code 70582 (Saint Martinville, LA) is in USDA hardiness zone 9a on the 2023 map: the coldest night of an average winter reaches 20 to 25 °F (−6.7 to −3.9 °C).

When is the last frost in Saint Martinville, LA?

The median last spring frost (32 °F) near 70582 is February 19; after March 16 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Lafayette 13 Se station.

When is the first frost in Saint Martinville, LA?

The median first fall frost near 70582 is December 1, giving a median frost-free growing season of 289 days.

When should I plant tomatoes in 70582?

Start tomato seeds indoors around Dec 25 – Jan 8 and set transplants outside around Feb 26 – Mar 12, one to three weeks after the median last frost.

How much rain and snow does 70582 get?

About 66.5 inches of precipitation a year (NOAA 1991–2020 normals, St. Martinville 0.2 S station).

How hot do summers get in Saint Martinville, LA?

The average high peaks at 90 °F in July, with about 66 days a year at 90 °F or more.

What kind of soil does 70582 have?

The USDA soil survey maps Gallion at the center of ZIP 70582: silt loam, well drained, pH about 6.5 (neutral).

Did spring come early in Saint Martinville, LA in 2026?

Spring leaf-out near 70582 came on Jan 11 in 2026, 14 days earlier than the 1991–2020 average (Jan 25), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Saint Martinville, LA?

Short-day onions: the longest day near 70582 is 14 h 05 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.