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

Planting zone for 68037 — Louisville, NE

ZIP code 68037 (Louisville, Cass County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is April 23 and the first fall frost October 16.

Where ZIP 68037 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.

Zone5b−15 to −10 °F

Coldest night−26.1 to −23.3 °C

Last frostApr 23

First frostOct 16

2012 zone5b

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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Louisville, NE…

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 Louisville, NE

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 23median — 50% chance of a later frost

Safe for tender plantsMay 6only 10% chance of frost after

First fall frostOctober 16median — 10% chance by Oct 1

Growing season175 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 13 and returns around October 25.

From the NOAA station Weeping Water, NE — 8 miles away, elevation 1,099 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 68037

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 12 – Mar 26

SpinachSow outdoors · Mar 12 – Apr 2

Broccoli, cabbageStart indoors · Feb 12 – Feb 26

Broccoli, cabbageTransplant · Apr 2 – Apr 16

Onion setsPlant outdoors · Mar 26 – Apr 9

PotatoesPlant outdoors · Apr 2 – Apr 16

LettuceSow outdoors · Mar 26 – Apr 9

Carrots, beetsSow outdoors · Apr 2 – Apr 16

TomatoesStart indoors · Feb 26 – Mar 12

TomatoesTransplant · Apr 30 – May 14

Peppers, eggplantStart indoors · Feb 12 – Feb 26

Peppers, eggplantTransplant · May 7 – May 21

BeansSow outdoors · Apr 30 – May 14

Sweet cornSow outdoors · Apr 30 – May 14

Cucumbers, squashSow outdoors · Apr 30 – May 14

Fall lettuce, spinachSow outdoors · Aug 21 – Sep 4

GarlicPlant cloves · Oct 2 – Nov 6

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 23) and first fall frost (Oct 16) 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 68037 came on Mar 11 — 18 days earlier than the 1991–2020 average (Mar 29).

average
Mar 292026
Mar 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 5b in Nebraska

420 plants native to the lower 48 states, recorded in Nebraska, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. 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 Louisville, NE.

Soil in Louisville, NE

The soil mapped at the center of ZIP 68037 is Marshall — silty clay loam, well drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up

pH6.0slightly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupCwater soaks in slowly

Farmland classprime farmlandUSDA classification

Map unit: Marshall silty clay loam, 2 to 6 percent slopes, eroded.

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 68037; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Louisville, NE

Summer high86 °Faverage high, July

Winter low14 °Faverage low, January

Hot days23days a year at 90 °F or more

Freezing nights140nights a year at 32 °F or less

Growing degree days3,448base 50 °F — the season’s usable heat

Longest day15 h 07 mindaylight on June 21

Shortest day9 h 13 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation33.6 inper year, rain and melted snow

Snowfall33 inper year; 36 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Weeping Water, NE (8 mi away); precipitation: Weeping Water, NE (8 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

5 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

680165b

Cedar Creek, NE · 3 mi

684036a

Manley, NE · 5 mi

680595b

Springfield, NE · 6 mi

680585b

South Bend, NE · 6 mi

684636a

Weeping Water, NE · 7 mi

684076a

Murdock, NE · 8 mi

680486a

Plattsmouth, NE · 10 mi

680466a

Papillion, NE · 10 mi

Nebraska planting zones →

Questions about 68037

What planting zone is ZIP code 68037?

ZIP code 68037 (Louisville, NE) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in Louisville, NE?

The median last spring frost (32 °F) near 68037 is April 23; after May 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Weeping Water station.

When is the first frost in Louisville, NE?

The median first fall frost near 68037 is October 16, giving a median frost-free growing season of 175 days.

When should I plant tomatoes in 68037?

Start tomato seeds indoors around Feb 26 – Mar 12 and set transplants outside around Apr 30 – May 14, one to three weeks after the median last frost.

How much rain and snow does 68037 get?

About 33.6 inches of precipitation a year and 33 inches of snowfall (NOAA 1991–2020 normals, Weeping Water station).

How hot do summers get in Louisville, NE?

The average high peaks at 86 °F in July, with about 23 days a year at 90 °F or more.

What kind of soil does 68037 have?

The USDA soil survey maps Marshall at the center of ZIP 68037: silty clay loam, well drained, pH about 6.0 (slightly acidic).

Did spring come early in Louisville, NE in 2026?

Spring leaf-out near 68037 came on Mar 11 in 2026, 18 days earlier than the 1991–2020 average (Mar 29), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Louisville, NE?

Long-day onions: the longest day near 68037 is 15 h 07 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).