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

Planting zone for 72761 — Siloam Springs, AR

ZIP code 72761 (Siloam Springs, Benton County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 8 and the first fall frost October 28.

Where ZIP 72761 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.

Zone7a0 to 5 °F

Coldest night−17.8 to −15 °C

Last frostApr 8

First frostOct 28

2012 zone7a

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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Siloam Springs, 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 Siloam Springs, AR

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 8median — 50% chance of a later frost

Safe for tender plantsApril 26only 10% chance of frost after

First fall frostOctober 28median — 10% chance by Oct 14

Growing season203 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 27 and returns around November 7.

From the NOAA station Fayetteville Nw Ar Airport, AR — 12 miles away, elevation 1,286 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 72761

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 25 – Mar 11

SpinachSow outdoors · Feb 25 – Mar 18

Broccoli, cabbageStart indoors · Jan 28 – Feb 11

Broccoli, cabbageTransplant · Mar 18 – Apr 1

Onion setsPlant outdoors · Mar 11 – Mar 25

PotatoesPlant outdoors · Mar 18 – Apr 1

LettuceSow outdoors · Mar 11 – Mar 25

Carrots, beetsSow outdoors · Mar 18 – Apr 1

TomatoesStart indoors · Feb 11 – Feb 25

TomatoesTransplant · Apr 15 – Apr 29

Peppers, eggplantStart indoors · Jan 28 – Feb 11

Peppers, eggplantTransplant · Apr 22 – May 6

BeansSow outdoors · Apr 15 – Apr 29

Sweet cornSow outdoors · Apr 15 – Apr 29

Cucumbers, squashSow outdoors · Apr 15 – Apr 29

Fall lettuce, spinachSow outdoors · Sep 2 – Sep 16

GarlicPlant cloves · Oct 14 – Nov 18

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 8) and first fall frost (Oct 28) 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 72761 came on Feb 15 — 15 days earlier than the 1991–2020 average (Mar 2).

average
Mar 22026
Feb 15

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 7a in Arkansas

501 plants native to the lower 48 states, recorded in Arkansas, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. 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 Siloam Springs, AR.

Soil in Siloam Springs, AR

The soil mapped at the center of ZIP 72761 is Healing — silt loam, well drained.

TextureSilt loama good balance for most vegetables

pH6.1slightly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupBwater soaks in moderately

Farmland classprime farmlandUSDA classification

Map unit: Healing silt loam, 0 to 3 percent slopes, occasionally 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 72761; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Siloam Springs, AR

Summer high90 °Faverage high, July

Winter low27 °Faverage low, January

Hot days45days a year at 90 °F or more

Freezing nights92nights a year at 32 °F or less

Growing degree days4,540base 50 °F — the season’s usable heat

Longest day14 h 37 mindaylight on June 21

Shortest day9 h 42 mindaylight on December 21

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

Precipitation50.1 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: Fayetteville Nw Ar Airport, AR (12 mi away); precipitation: Decatur 2.6 Ese, AR (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

Fayetteville, AR · 10 mi

727287a

Elm Springs, AR · 12 mi

749647a

Watts, OK · 12 mi

727707a

Tontitown, AR · 12 mi

727227a

Decatur, AR · 12 mi

727627a

Springdale, AR · 13 mi

Arkansas planting zones →

Questions about 72761

What planting zone is ZIP code 72761?

ZIP code 72761 (Siloam Springs, AR) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Siloam Springs, AR?

The median last spring frost (32 °F) near 72761 is April 8; after April 26 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Fayetteville Nw Ar Airport station.

When is the first frost in Siloam Springs, AR?

The median first fall frost near 72761 is October 28, giving a median frost-free growing season of 203 days.

When should I plant tomatoes in 72761?

Start tomato seeds indoors around Feb 11 – Feb 25 and set transplants outside around Apr 15 – Apr 29, one to three weeks after the median last frost.

How much rain and snow does 72761 get?

About 50.1 inches of precipitation a year (NOAA 1991–2020 normals, Decatur 2.6 Ese station).

How hot do summers get in Siloam Springs, AR?

The average high peaks at 90 °F in July, with about 45 days a year at 90 °F or more.

What kind of soil does 72761 have?

The USDA soil survey maps Healing at the center of ZIP 72761: silt loam, well drained, pH about 6.1 (slightly acidic).

Did spring come early in Siloam Springs, AR in 2026?

Spring leaf-out near 72761 came on Feb 15 in 2026, 15 days earlier than the 1991–2020 average (Mar 2), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Siloam Springs, AR?

Intermediate onions: the longest day near 72761 is 14 h 37 min, so day-neutral types bulb best; long-day varieties may not bulb fully.