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

Planting zone for 70078 — New Sarpy, LA

ZIP code 70078 (New Sarpy, St. Charles County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F.

Where ZIP 70078 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.

Zone9b25 to 30 °F
Coldest night−3.9 to −1.1 °C
Last frostrare
First frostrare
2012 zone9a

Was 9a on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 9b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for New Sarpy, 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 New Orleans Intl Airport, LA — 8 miles away, elevation 3 ft) the median growing season is 333 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 70078 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 New Sarpy, LA.

Soil in New Sarpy, LA

The soil mapped at the center of ZIP 70078 is Thibaut — clay, poorly drained.

TextureClayholds water and nutrients; slow to drain and warm up
pH6.7neutral; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter2%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classprime farmlandUSDA classification

Map unit: Thibaut clay, 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 70078; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in New Sarpy, LA

Summer high91 °Faverage high, July
Winter low46 °Faverage low, January
Hot days85days a year at 90 °F or more
Freezing nights5nights a year at 32 °F or less
Growing degree days7,640base 50 °F — the season’s usable heat
Longest day14 h 05 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
Precipitation63.4 inper year, rain and melted snow

Average high and low, by month

40°50°60°70°80°90°100°January: average high 63 °F, low 46 °F 63°46° JanFebruary: average high 66 °F, low 50 °F 66°50° FebMarch: average high 72 °F, low 55 °F 72°55° MarApril: average high 79 °F, low 62 °F 79°62° AprMay: average high 85 °F, low 69 °F 85°69° MayJune: average high 90 °F, low 75 °F 90°75° JunJuly: average high 91 °F, low 77 °F 91°77° JulAugust: average high 91 °F, low 77 °F 91°77° AugSeptember: average high 88 °F, low 74 °F 88°74° SepOctober: average high 81 °F, low 64 °F 81°64° OctNovember: average high 71 °F, low 54 °F 71°54° NovDecember: average high 65 °F, low 48 °F 65°48° Dec

Precipitation by month inches

0″2″4″6″8″January: 5.18 in precipitation 5.2 JanFebruary: 4.13 in precipitation 4.1 FebMarch: 4.36 in precipitation 4.4 MarApril: 5.22 in precipitation 5.2 AprMay: 5.64 in precipitation 5.6 MayJune: 7.62 in precipitation 7.6 JunJuly: 6.79 in precipitation 6.8 JulAugust: 6.91 in precipitation 6.9 AugSeptember: 5.11 in precipitation 5.1 SepOctober: 3.70 in precipitation 3.7 OctNovember: 3.87 in precipitation 3.9 NovDecember: 4.82 in precipitation 4.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: New Orleans Intl Airport, LA (8 mi away); precipitation: New Orleans Intl Airport, LA (8 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9b.

700479b
Destrehan, LA · 2 mi
700799b
Norco, LA · 2 mi
700879b
Saint Rose, LA · 4 mi
700579b
Hahnville, LA · 5 mi
700319b
Ama, LA · 6 mi
700399b
Boutte, LA · 7 mi
700979b
Kenner, LA · 8 mi
700629b
Kenner, LA · 8 mi

Louisiana planting zones →

Questions about 70078

What planting zone is ZIP code 70078?

ZIP code 70078 (New Sarpy, LA) is in USDA hardiness zone 9b on the 2023 map: the coldest night of an average winter reaches 25 to 30 °F (−3.9 to −1.1 °C).

How much rain and snow does 70078 get?

About 63.4 inches of precipitation a year (NOAA 1991–2020 normals, New Orleans Intl Airport station).

How hot do summers get in New Sarpy, LA?

The average high peaks at 91 °F in July, with about 85 days a year at 90 °F or more.

What kind of soil does 70078 have?

The USDA soil survey maps Thibaut at the center of ZIP 70078: clay, poorly drained, pH about 6.7 (neutral).

Did spring come early in New Sarpy, LA in 2026?

Spring leaf-out near 70078 came on Jan 11 in 2026, 12 days earlier than the 1991–2020 average (Jan 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in New Sarpy, LA?

Short-day onions: the longest day near 70078 is 14 h 05 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

Did the zone for 70078 change?

Yes. The 2012 USDA map put 70078 in zone 9a; the 2023 map puts it in zone 9b. The newer map uses 1991–2020 data and more weather stations.