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

Planting zone for 72128 — Poyen, AR

ZIP code 72128 (Poyen, Grant County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is April 2 and the first fall frost November 2.

Where ZIP 72128 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.

Zone8a10 to 15 °F

Coldest night−12.2 to −9.4 °C

Last frostApr 2

First frostNov 2

2012 zone8a

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 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Poyen, 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 Poyen, AR

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 2median — 50% chance of a later frost

Safe for tender plantsApril 18only 10% chance of frost after

First fall frostNovember 2median — 10% chance by Oct 19

Growing season215 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 20 and returns around November 11.

From the NOAA station Leola, AR — 10 miles away, elevation 256 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 72128

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 19 – Mar 5

SpinachSow outdoors · Feb 19 – Mar 12

Broccoli, cabbageStart indoors · Jan 22 – Feb 5

Broccoli, cabbageTransplant · Mar 12 – Mar 26

Onion setsPlant outdoors · Mar 5 – Mar 19

PotatoesPlant outdoors · Mar 12 – Mar 26

LettuceSow outdoors · Mar 5 – Mar 19

Carrots, beetsSow outdoors · Mar 12 – Mar 26

TomatoesStart indoors · Feb 5 – Feb 19

TomatoesTransplant · Apr 9 – Apr 23

Peppers, eggplantStart indoors · Jan 22 – Feb 5

Peppers, eggplantTransplant · Apr 16 – Apr 30

BeansSow outdoors · Apr 9 – Apr 23

Sweet cornSow outdoors · Apr 9 – Apr 23

Cucumbers, squashSow outdoors · Apr 9 – Apr 23

Fall lettuce, spinachSow outdoors · Sep 7 – Sep 21

GarlicPlant cloves · Oct 19 – Nov 23

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 2) and first fall frost (Nov 2) 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 72128 came on Feb 13 — about the same time as the 1991–2020 average (Feb 14).

average
Feb 142026
Feb 13

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 8a in Arkansas

516 plants native to the lower 48 states, recorded in Arkansas, and rated by the USDA to survive 10 °F or colder — the bottom of zone 8a. 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 Poyen, AR.

Soil in Poyen, AR

The soil mapped at the center of ZIP 72128 is Bibb — fine sandy loam, poorly drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding

pH4.6strongly acidic; most vegetables like 6.0–7.0

DrainagePoorly drainedconsider raised beds

Organic matter2%moderate

Hydrologic groupB/Dmoderate when drained; wet otherwise

Farmland classNot prime farmlandUSDA classification

Map unit: Bibb fine sandy loam, 0 to 1 percent slopes, frequently flooded.

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 72128; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Poyen, AR

Summer high93 °Faverage high, July

Winter low30 °Faverage low, January

Hot days72days a year at 90 °F or more

Freezing nights69nights a year at 32 °F or less

Growing degree days5,300base 50 °F — the season’s usable heat

Longest day14 h 27 mindaylight on June 21

Shortest day9 h 51 mindaylight on December 21

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

Precipitation57.8 inper year, rain and melted snow

Snowfall2 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: Leola, AR (10 mi away); precipitation: Leola, AR (10 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8a.

721298a

Prattsville, AR · 5 mi

Arkansas planting zones →

Questions about 72128

What planting zone is ZIP code 72128?

ZIP code 72128 (Poyen, AR) is in USDA hardiness zone 8a on the 2023 map: the coldest night of an average winter reaches 10 to 15 °F (−12.2 to −9.4 °C).

When is the last frost in Poyen, AR?

The median last spring frost (32 °F) near 72128 is April 2; after April 18 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Leola station.

When is the first frost in Poyen, AR?

The median first fall frost near 72128 is November 2, giving a median frost-free growing season of 215 days.

When should I plant tomatoes in 72128?

Start tomato seeds indoors around Feb 5 – Feb 19 and set transplants outside around Apr 9 – Apr 23, one to three weeks after the median last frost.

How much rain and snow does 72128 get?

About 57.8 inches of precipitation a year and 2 inches of snowfall (NOAA 1991–2020 normals, Leola station).

How hot do summers get in Poyen, AR?

The average high peaks at 93 °F in July, with about 72 days a year at 90 °F or more.

What kind of soil does 72128 have?

The USDA soil survey maps Bibb at the center of ZIP 72128: fine sandy loam, poorly drained, pH about 4.6 (strongly acidic).

Did spring come early in Poyen, AR in 2026?

Spring leaf-out near 72128 came on Feb 13 in 2026, about the same as the 1991–2020 average (Feb 14), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Poyen, AR?

Intermediate onions: the longest day near 72128 is 14 h 27 min, so day-neutral types bulb best; long-day varieties may not bulb fully.