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

Planting zone for Marrero, LA

Marrero, LA is in USDA zone 9b across its 2 ZIP codes. The median last spring frost is February 10 and the first fall frost December 12.

Marrero 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 frostFeb 10

First frostDec 12

Growing season306 days

9b 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

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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 Marrero, LA

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostFebruary 10median — 50% chance of a later frost

Safe for tender plantsMarch 10only 10% chance of frost after

First fall frostDecember 12median — 10% chance by Nov 20

Growing season306 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 27 and returns around January 1.

From the NOAA station Marrero 9 Ssw, LA, elevation 3 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 Marrero

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Dec 30 – Jan 13

SpinachSow outdoors · Dec 30 – Jan 20

Broccoli, cabbageStart indoors · Dec 2 – Dec 16

Broccoli, cabbageTransplant · Jan 20 – Feb 3

Onion setsPlant outdoors · Jan 13 – Jan 27

PotatoesPlant outdoors · Jan 20 – Feb 3

LettuceSow outdoors · Jan 13 – Jan 27

Carrots, beetsSow outdoors · Jan 20 – Feb 3

TomatoesStart indoors · Dec 16 – Dec 30

TomatoesTransplant · Feb 17 – Mar 3

Peppers, eggplantStart indoors · Dec 2 – Dec 16

Peppers, eggplantTransplant · Feb 24 – Mar 10

BeansSow outdoors · Feb 17 – Mar 3

Sweet cornSow outdoors · Feb 17 – Mar 3

Cucumbers, squashSow outdoors · Feb 17 – Mar 3

Fall lettuce, spinachSow outdoors · Oct 17 – Oct 31

GarlicPlant cloves · Nov 28 – Jan 2

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 10) and first fall frost (Dec 12) 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 70073 came on Jan 11 — 12 days earlier than the 1991–2020 average (Jan 23).

average
Jan 232026
Jan 11

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.

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 Marrero, LA.

Soil in Marrero, LA

The soil mapped at the center of ZIP 70073 is Cancienne — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables

pH5.7moderately acidic; most vegetables like 6.0–7.0

DrainageSomewhat poorly drainedconsider raised beds

Organic matter2.25%moderate

Hydrologic groupCwater soaks in slowly

Farmland classprime farmlandUSDA classification

Map unit: Cancienne silt loam, 0 to 1 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 70073; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Marrero, LA

Summer high94 °Faverage high, July

Winter low47 °Faverage low, January

Hot days106days a year at 90 °F or more

Freezing nights4nights a year at 32 °F or less

Growing degree days8,076base 50 °F — the season’s usable heat

Longest day14 h 04 mindaylight on June 21

Shortest day10 h 13 mindaylight on December 21

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

Precipitation64.6 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: New Orleans Audubon, LA (2 mi away); precipitation: New Orleans Audubon, LA (2 mi away). Daylight is calculated from latitude.

ZIP codes in Marrero

Louisiana planting zones →

Questions about Marrero

What planting zone is Marrero, LA?

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

When is the last frost in Marrero, LA?

The median last spring frost is February 10 and the median first fall frost is December 12 (NOAA 1991–2020 normals, Marrero 9 Ssw station).

When can I plant a garden in Marrero, LA?

Cool-season crops like peas and spinach go in around Dec 30 – Jan 20; tomatoes, peppers, beans and squash after about Feb 17, once frost risk has passed.

What kind of onions grow in Marrero, LA?

Short-day onions: the longest day is 14 h 04 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

How much rain and snow does Marrero, LA get?

About 64.6 inches of precipitation a year (NOAA 1991–2020 normals).