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

Planting zone for 70726 — Denham Springs, LA

ZIP code 70726 (Denham Springs, Livingston County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is February 25 and the first fall frost November 26.

Where ZIP 70726 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 25

First frostNov 26

2012 zone8b

Was 8b 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 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Denham Springs, 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 Denham Springs, LA

JanFebMarAprMayJunJulAugSepOctNovDec

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

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

Safe for tender plantsMarch 19only 10% chance of frost after

First fall frostNovember 26median — 10% chance by Nov 7

Growing season276 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 6 and returns around December 11.

From the NOAA station Baton Rouge Ryan Airport, LA — 16 miles away, elevation 66 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 70726

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Jan 14 – Jan 28

SpinachSow outdoors · Jan 14 – Feb 4

Broccoli, cabbageStart indoors · Dec 17 – Dec 31

Broccoli, cabbageTransplant · Feb 4 – Feb 18

Onion setsPlant outdoors · Jan 28 – Feb 11

PotatoesPlant outdoors · Feb 4 – Feb 18

LettuceSow outdoors · Jan 28 – Feb 11

Carrots, beetsSow outdoors · Feb 4 – Feb 18

TomatoesStart indoors · Dec 31 – Jan 14

TomatoesTransplant · Mar 4 – Mar 18

Peppers, eggplantStart indoors · Dec 17 – Dec 31

Peppers, eggplantTransplant · Mar 11 – Mar 25

BeansSow outdoors · Mar 4 – Mar 18

Sweet cornSow outdoors · Mar 4 – Mar 18

Cucumbers, squashSow outdoors · Mar 4 – Mar 18

Fall lettuce, spinachSow outdoors · Oct 1 – Oct 15

GarlicPlant cloves · Nov 12 – Dec 17

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 25) and first fall frost (Nov 26) 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 70726 came on Jan 11 — 15 days earlier than the 1991–2020 average (Jan 26).

average
Jan 262026
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 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.

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 Denham Springs, LA.

Soil in Denham Springs, LA

The soil mapped at the center of ZIP 70726 is Springfield — silt loam, poorly drained.

TextureSilt loama good balance for most vegetables

pH5.3strongly acidic; most vegetables like 6.0–7.0

DrainagePoorly drainedconsider raised beds

Organic matter1.25%low — add compost

Hydrologic groupC/Dslow when drained; wet otherwise

Farmland classprime farmlandUSDA classification

Map unit: Springfield silt loam.

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 70726; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Denham Springs, LA

Summer high92 °Faverage high, July

Winter low42 °Faverage low, January

Hot days96days a year at 90 °F or more

Freezing nights18nights a year at 32 °F or less

Growing degree days6,997base 50 °F — the season’s usable heat

Longest day14 h 07 mindaylight on June 21

Shortest day10 h 11 mindaylight on December 21

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

Precipitation64.3 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: Baton Rouge Ryan Airport, LA (16 mi away); precipitation: Denham Springs, LA (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9a.

708179a

Baton Rouge, LA · 6 mi

708199a

Baton Rouge, LA · 7 mi

708169a

Baton Rouge, LA · 7 mi

707279a

Denham Springs, LA · 7 mi

708219a

Baton Rouge, LA · 9 mi

707699a

Prairieville, LA · 9 mi

707549a

Livingston, LA · 9 mi

707859a

Walker, LA · 10 mi

All 3 ZIP codes in Denham Springs → · Louisiana planting zones →

Questions about 70726

What planting zone is ZIP code 70726?

ZIP code 70726 (Denham Springs, 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 Denham Springs, LA?

The median last spring frost (32 °F) near 70726 is February 25; after March 19 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Baton Rouge Ryan Airport station.

When is the first frost in Denham Springs, LA?

The median first fall frost near 70726 is November 26, giving a median frost-free growing season of 276 days.

When should I plant tomatoes in 70726?

Start tomato seeds indoors around Dec 31 – Jan 14 and set transplants outside around Mar 4 – Mar 18, one to three weeks after the median last frost.

How much rain and snow does 70726 get?

About 64.3 inches of precipitation a year (NOAA 1991–2020 normals, Denham Springs station).

How hot do summers get in Denham Springs, LA?

The average high peaks at 92 °F in July, with about 96 days a year at 90 °F or more.

What kind of soil does 70726 have?

The USDA soil survey maps Springfield at the center of ZIP 70726: silt loam, poorly drained, pH about 5.3 (strongly acidic).

Did spring come early in Denham Springs, LA in 2026?

Spring leaf-out near 70726 came on Jan 11 in 2026, 15 days earlier than the 1991–2020 average (Jan 26), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Denham Springs, LA?

Short-day onions: the longest day near 70726 is 14 h 07 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

Did the zone for 70726 change?

Yes. The 2012 USDA map put 70726 in zone 8b; the 2023 map puts it in zone 9a. The newer map uses 1991–2020 data and more weather stations.