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

Planting zone for 70592 — Youngsville, LA

ZIP code 70592 (Youngsville, Lafayette County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is February 10 and the first fall frost December 11.

Where ZIP 70592 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 10
First frostDec 11
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 Youngsville, 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 Youngsville, 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 9only 10% chance of frost after
First fall frostDecember 11median — 10% chance by Nov 17
Growing season305 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 29 and returns around January 3.

From the NOAA station New Iberia Acadiana Airport, LA — 9 miles away, elevation 23 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 70592

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 16 – Oct 30
GarlicPlant cloves · Nov 27 – Jan 1
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 10) and first fall frost (Dec 11) 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 70592 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 Youngsville, LA.

Soil in Youngsville, LA

The soil mapped at the center of ZIP 70592 is Frost — silt loam, poorly drained.

TextureSilt loama good balance for most vegetables
pH5.5moderately acidic; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter2.25%moderate
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classprime farmlandUSDA classification

Map unit: Frost 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 70592; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Youngsville, LA

Summer high93 °Faverage high, August
Winter low43 °Faverage low, January
Hot days90days a year at 90 °F or more
Freezing nights10nights a year at 32 °F or less
Growing degree days7,451base 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
Precipitation59.7 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°32 °FJanuary: average high 64 °F, low 43 °F 64°43° JanFebruary: average high 67 °F, low 47 °F 67°47° FebMarch: average high 74 °F, low 53 °F 74°53° MarApril: average high 80 °F, low 60 °F 80°60° AprMay: average high 86 °F, low 67 °F 86°67° MayJune: average high 90 °F, low 73 °F 90°73° JunJuly: average high 92 °F, low 75 °F 92°75° JulAugust: average high 93 °F, low 75 °F 93°75° AugSeptember: average high 90 °F, low 71 °F 90°71° SepOctober: average high 83 °F, low 60 °F 83°60° OctNovember: average high 73 °F, low 50 °F 73°50° NovDecember: average high 66 °F, low 45 °F 66°45° Dec

Precipitation by month inches

0″2″4″6″January: 5.36 in precipitation 5.4 JanFebruary: 3.54 in precipitation 3.5 FebMarch: 2.91 in precipitation 2.9 MarApril: 4.82 in precipitation 4.8 AprMay: 4.39 in precipitation 4.4 MayJune: 6.46 in precipitation 6.5 JunJuly: 6.71 in precipitation 6.7 JulAugust: 6.37 in precipitation 6.4 AugSeptember: 5.05 in precipitation 5.0 SepOctober: 5.09 in precipitation 5.1 OctNovember: 4.50 in precipitation 4.5 NovDecember: 4.49 in precipitation 4.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: New Iberia Acadiana Airport, LA (9 mi away); precipitation: New Iberia Acadiana Regional Airport, LA (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9a.

705589a
Milton, LA · 4 mi
705089a
Lafayette, LA · 5 mi
705099a
Lafayette, LA · 6 mi
705199a
Cade, LA · 7 mi
705189a
Broussard, LA · 7 mi
705039a
Lafayette, LA · 7 mi
705559a
Maurice, LA · 8 mi
705059a
Lafayette, LA · 9 mi

Louisiana planting zones →

Questions about 70592

What planting zone is ZIP code 70592?

ZIP code 70592 (Youngsville, 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 Youngsville, LA?

The median last spring frost (32 °F) near 70592 is February 10; after March 9 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, New Iberia Acadiana Airport station.

When is the first frost in Youngsville, LA?

The median first fall frost near 70592 is December 11, giving a median frost-free growing season of 305 days.

When should I plant tomatoes in 70592?

Start tomato seeds indoors around Dec 16 – Dec 30 and set transplants outside around Feb 17 – Mar 3, one to three weeks after the median last frost.

How much rain and snow does 70592 get?

About 59.7 inches of precipitation a year (NOAA 1991–2020 normals, New Iberia Acadiana Regional Airport station).

How hot do summers get in Youngsville, LA?

The average high peaks at 93 °F in August, with about 90 days a year at 90 °F or more.

What kind of soil does 70592 have?

The USDA soil survey maps Frost at the center of ZIP 70592: silt loam, poorly drained, pH about 5.5 (moderately acidic).

Did spring come early in Youngsville, LA in 2026?

Spring leaf-out near 70592 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 Youngsville, LA?

Short-day onions: the longest day near 70592 is 14 h 05 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.