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

Planting zone for 72072 — Humnoke, AR

ZIP code 72072 (Humnoke, Lonoke County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 21 and the first fall frost November 9.

Where ZIP 72072 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.

Zone8b15 to 20 °F

Coldest night−9.4 to −6.7 °C

Last frostMar 21

First frostNov 9

2012 zone8a

Was 8a 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 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Humnoke, AR…

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 Humnoke, AR

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 21median — 50% chance of a later frost

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

First fall frostNovember 9median — 10% chance by Oct 27

Growing season235 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 8 and returns around November 22.

From the NOAA station Keo, AR — 14 miles away, elevation 230 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 72072

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 7 – Feb 21

SpinachSow outdoors · Feb 7 – Feb 28

Broccoli, cabbageStart indoors · Jan 10 – Jan 24

Broccoli, cabbageTransplant · Feb 28 – Mar 14

Onion setsPlant outdoors · Feb 21 – Mar 7

PotatoesPlant outdoors · Feb 28 – Mar 14

LettuceSow outdoors · Feb 21 – Mar 7

Carrots, beetsSow outdoors · Feb 28 – Mar 14

TomatoesStart indoors · Jan 24 – Feb 7

TomatoesTransplant · Mar 28 – Apr 11

Peppers, eggplantStart indoors · Jan 10 – Jan 24

Peppers, eggplantTransplant · Apr 4 – Apr 18

BeansSow outdoors · Mar 28 – Apr 11

Sweet cornSow outdoors · Mar 28 – Apr 11

Cucumbers, squashSow outdoors · Mar 28 – Apr 11

Fall lettuce, spinachSow outdoors · Sep 14 – Sep 28

GarlicPlant cloves · Oct 26 – Nov 30

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 21) and first fall frost (Nov 9) 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 72072 came on Feb 14 — about the same time as the 1991–2020 average (Feb 15).

average
Feb 152026
Feb 14

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 8b in Arkansas

521 plants native to the lower 48 states, recorded in Arkansas, and rated by the USDA to survive 15 °F or colder — the bottom of zone 8b. 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 Humnoke, AR.

Soil in Humnoke, AR

The soil mapped at the center of ZIP 72072 is Hebert — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables

pH5.9moderately acidic; most vegetables like 6.0–7.0

DrainageSomewhat poorly drainedconsider raised beds

Organic matter1.25%low — add compost

Hydrologic groupCwater soaks in slowly

Farmland classprime farmlandUSDA classification

Map unit: Hebert 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 72072; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Humnoke, AR

Summer high90 °Faverage high, July

Winter low31 °Faverage low, January

Hot days53days a year at 90 °F or more

Freezing nights49nights a year at 32 °F or less

Growing degree days5,083base 50 °F — the season’s usable heat

Longest day14 h 28 mindaylight on June 21

Shortest day9 h 50 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation50.7 inper year, rain and melted snow

Snowfall3 inper year; 1 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: Keo, AR (14 mi away); precipitation: Stuttgart, AR (13 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

720378a

Coy, AR · 6 mi

720048b

Altheimer, AR · 10 mi

Wabbaseka, AR · 12 mi

721688a

Tucker, AR · 13 mi

721608b

Stuttgart, AR · 14 mi

720838a

Keo, AR · 15 mi

Arkansas planting zones →

Questions about 72072

What planting zone is ZIP code 72072?

ZIP code 72072 (Humnoke, AR) is in USDA hardiness zone 8b on the 2023 map: the coldest night of an average winter reaches 15 to 20 °F (−9.4 to −6.7 °C).

When is the last frost in Humnoke, AR?

The median last spring frost (32 °F) near 72072 is March 21; after April 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Keo station.

When is the first frost in Humnoke, AR?

The median first fall frost near 72072 is November 9, giving a median frost-free growing season of 235 days.

When should I plant tomatoes in 72072?

Start tomato seeds indoors around Jan 24 – Feb 7 and set transplants outside around Mar 28 – Apr 11, one to three weeks after the median last frost.

How much rain and snow does 72072 get?

About 50.7 inches of precipitation a year and 3 inches of snowfall (NOAA 1991–2020 normals, Stuttgart station).

How hot do summers get in Humnoke, AR?

The average high peaks at 90 °F in July, with about 53 days a year at 90 °F or more.

What kind of soil does 72072 have?

The USDA soil survey maps Hebert at the center of ZIP 72072: silt loam, somewhat poorly drained, pH about 5.9 (moderately acidic).

Did spring come early in Humnoke, AR in 2026?

Spring leaf-out near 72072 came on Feb 14 in 2026, about the same as the 1991–2020 average (Feb 15), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Humnoke, AR?

Intermediate onions: the longest day near 72072 is 14 h 28 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 72072 change?

Yes. The 2012 USDA map put 72072 in zone 8a; the 2023 map puts it in zone 8b. The newer map uses 1991–2020 data and more weather stations.