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

Planting zone for Morgan City, LA

Morgan City, LA is in USDA zone 9b across its 2 ZIP codes.

Morgan City on the zone map

Outlined: its 1 ZIP code areas · 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.

Zone9b25 to 30 °F
ZIP codes2
Last frostrare
First frostrare
Growing seasonall year

9b 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Morgan City, 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

A 32 °F frost doesn't happen here in most winters. At the nearest station (NOAA station Morgan City, LA, elevation 7 ft) the median growing season is 335 days. When frost does come, it is a midwinter night or two; cover tender plants when a freeze is forecast.

Frost data: NOAA NCEI U.S. Climate Normals 1991–2020.

When spring arrived in 2026

In 2026, spring leaf-out near 70380 came on Jan 11 — 12 days earlier than the 1991–2020 average (Jan 23).

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 9b in Louisiana

519 plants native to the lower 48 states, recorded in Louisiana, and rated by the USDA to survive 25 °F or colder — the bottom of zone 9b. 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 170

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 Morgan City, LA.

Soil in Morgan City, LA

The soil mapped at the center of ZIP 70380 is Fausse — mucky clay, very poorly drained.

TextureMucky clayholds water and nutrients; slow to drain and warm up
pH6.0slightly acidic; most vegetables like 6.0–7.0
DrainageVery poorly drainedconsider raised beds
Organic matter8.5%high
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Fausse association, 0 to 1 percent slopes, frequently flooded.

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 70380; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Morgan City, LA

Summer high91 °Faverage high, July
Winter low45 °Faverage low, January
Hot days53days a year at 90 °F or more
Freezing nights7nights a year at 32 °F or less
Growing degree days7,501base 50 °F — the season’s usable heat
Longest day14 h 03 mindaylight on June 21
Shortest day10 h 14 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation58.5 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°32 °FJanuary: average high 63 °F, low 45 °F 63°45° JanFebruary: average high 67 °F, low 49 °F 67°49° FebMarch: average high 72 °F, low 55 °F 72°55° MarApril: average high 78 °F, low 61 °F 78°61° AprMay: average high 84 °F, low 69 °F 84°69° MayJune: average high 89 °F, low 75 °F 89°75° JunJuly: average high 91 °F, low 76 °F 91°76° JulAugust: average high 90 °F, low 76 °F 90°76° AugSeptember: average high 88 °F, low 73 °F 88°73° SepOctober: average high 81 °F, low 64 °F 81°64° OctNovember: average high 72 °F, low 53 °F 72°53° NovDecember: average high 66 °F, low 48 °F 66°48° Dec

Precipitation by month inches

0″2″4″6″8″January: 4.99 in precipitation 5.0 JanFebruary: 3.27 in precipitation 3.3 FebMarch: 3.86 in precipitation 3.9 MarApril: 4.02 in precipitation 4.0 AprMay: 4.55 in precipitation 4.5 MayJune: 7.02 in precipitation 7.0 JunJuly: 6.23 in precipitation 6.2 JulAugust: 7.27 in precipitation 7.3 AugSeptember: 5.40 in precipitation 5.4 SepOctober: 4.03 in precipitation 4.0 OctNovember: 3.91 in precipitation 3.9 NovDecember: 3.96 in precipitation 4.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Morgan City, LA (6 mi away); precipitation: Morgan City, LA (6 mi away). Daylight is calculated from latitude.

ZIP codes in Morgan City

703809b
25 to 30 °F
703819b
25 to 30 °F

Louisiana planting zones →

Questions about Morgan City

What planting zone is Morgan City, LA?

Morgan City, LA is in USDA hardiness zone 9b on the 2023 map (9b: 25 to 30 °F).

What kind of onions grow in Morgan City, LA?

Short-day onions: the longest day is 14 h 03 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

How much rain and snow does Morgan City, LA get?

About 58.5 inches of precipitation a year (NOAA 1991–2020 normals).