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

Planting zone for 72917 — Fort Smith, AR

ZIP code 72917 (Fort Smith, Sebastian County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 25 and the first fall frost November 6.

Where ZIP 72917 is

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 frostMar 25
First frostNov 6
2012 zone7b

Was 7b 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 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Fort Smith, 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 Fort Smith, AR

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 25median — 50% chance of a later frost
Safe for tender plantsApril 11only 10% chance of frost after
First fall frostNovember 6median — 10% chance by Oct 23
Growing season224 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 11 and returns around November 17.

From the NOAA station Ft Smith Regional Airport, AR — 4 miles away, elevation 449 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 72917

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 11 – Feb 25
SpinachSow outdoors · Feb 11 – Mar 4
Broccoli, cabbageStart indoors · Jan 14 – Jan 28
Broccoli, cabbageTransplant · Mar 4 – Mar 18
Onion setsPlant outdoors · Feb 25 – Mar 11
PotatoesPlant outdoors · Mar 4 – Mar 18
LettuceSow outdoors · Feb 25 – Mar 11
Carrots, beetsSow outdoors · Mar 4 – Mar 18
TomatoesStart indoors · Jan 28 – Feb 11
TomatoesTransplant · Apr 1 – Apr 15
Peppers, eggplantStart indoors · Jan 14 – Jan 28
Peppers, eggplantTransplant · Apr 8 – Apr 22
BeansSow outdoors · Apr 1 – Apr 15
Sweet cornSow outdoors · Apr 1 – Apr 15
Cucumbers, squashSow outdoors · Apr 1 – Apr 15
Fall lettuce, spinachSow outdoors · Sep 11 – Sep 25
GarlicPlant cloves · Oct 23 – Nov 27
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 25) and first fall frost (Nov 6) 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 72917 came on Feb 12 — 8 days earlier than the 1991–2020 average (Feb 20).

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.

Trees 71

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °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 °Fbitternut hickory75 ft · blooms mid spring · high shade tolerance · to −47 °F

Shrubs 98

alternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °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 174

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °FAmerican speedwell0.8 ft · blooms mid summer · low shade tolerance · to −38 °F

Grasses 150

alkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °FAmerican cupscale3 ft · blooms early summer · high shade tolerance · to −18 °Fautumn bluegrass1.5 ft · blooms late spring · medium shade tolerance · to −8 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °FBicknell's sedge3 ft · blooms late spring · low shade tolerance · to −38 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °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 Fort Smith, AR.

Soil in Fort Smith, AR

The soil mapped at the center of ZIP 72917 is Leadvale — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables
pH5.0strongly acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classprime farmlandUSDA classification

Map unit: Leadvale silt loam, 1 to 3 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 72917; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Fort Smith, AR

Summer high94 °Faverage high, July
Winter low30 °Faverage low, January
Hot days78days a year at 90 °F or more
Freezing nights63nights a year at 32 °F or less
Growing degree days5,500base 50 °F — the season’s usable heat
Longest day14 h 33 mindaylight on June 21
Shortest day9 h 46 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation47.3 inper year, rain and melted snow
Snowfall3 inper year; 1 days with snow on the ground

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 51 °F, low 30 °F 51°30° JanFebruary: average high 57 °F, low 33 °F 57°33° FebMarch: average high 66 °F, low 42 °F 66°42° MarApril: average high 75 °F, low 50 °F 75°50° AprMay: average high 81 °F, low 60 °F 81°60° MayJune: average high 89 °F, low 68 °F 89°68° JunJuly: average high 94 °F, low 72 °F 94°72° JulAugust: average high 94 °F, low 71 °F 94°71° AugSeptember: average high 87 °F, low 63 °F 87°63° SepOctober: average high 76 °F, low 51 °F 76°51° OctNovember: average high 63 °F, low 40 °F 63°40° NovDecember: average high 53 °F, low 32 °F 53°32° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 2.91 in precipitation, 1.4 in snowfall 2.9❄1 JanFebruary: 2.69 in precipitation, 0.6 in snowfall 2.7❄1 FebMarch: 3.90 in precipitation, 0.3 in snowfall 3.9 MarApril: 4.87 in precipitation 4.9 AprMay: 5.63 in precipitation 5.6 MayJune: 4.56 in precipitation 4.6 JunJuly: 3.39 in precipitation 3.4 JulAugust: 3.60 in precipitation 3.6 AugSeptember: 4.04 in precipitation 4.0 SepOctober: 4.42 in precipitation 4.4 OctNovember: 3.85 in precipitation 3.9 NovDecember: 3.48 in precipitation, 0.6 in snowfall 3.5❄1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Ft Smith Regional Airport, AR (4 mi away); precipitation: Ft Smith Regional Airport, AR (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8a.

729068a
Fort Smith, AR · <1 mi
729138a
Fort Smith, AR · <1 mi
729148a
Fort Smith, AR · <1 mi
729188a
Fort Smith, AR · <1 mi
729198a
Fort Smith, AR · <1 mi
729028a
Fort Smith, AR · <1 mi
729018a
Fort Smith, AR · 2 mi
729048a
Fort Smith, AR · 2 mi

All 13 ZIP codes in Fort Smith → · Arkansas planting zones →

Questions about 72917

What planting zone is ZIP code 72917?

ZIP code 72917 (Fort Smith, 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 Fort Smith, AR?

The median last spring frost (32 °F) near 72917 is March 25; after April 11 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Ft Smith Regional Airport station.

When is the first frost in Fort Smith, AR?

The median first fall frost near 72917 is November 6, giving a median frost-free growing season of 224 days.

When should I plant tomatoes in 72917?

Start tomato seeds indoors around Jan 28 – Feb 11 and set transplants outside around Apr 1 – Apr 15, one to three weeks after the median last frost.

How much rain and snow does 72917 get?

About 47.3 inches of precipitation a year and 3 inches of snowfall (NOAA 1991–2020 normals, Ft Smith Regional Airport station).

How hot do summers get in Fort Smith, AR?

The average high peaks at 94 °F in July, with about 78 days a year at 90 °F or more.

What kind of soil does 72917 have?

The USDA soil survey maps Leadvale at the center of ZIP 72917: silt loam, moderately well drained, pH about 5.0 (strongly acidic).

Did spring come early in Fort Smith, AR in 2026?

Spring leaf-out near 72917 came on Feb 12 in 2026, 8 days earlier than the 1991–2020 average (Feb 20), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Fort Smith, AR?

Intermediate onions: the longest day near 72917 is 14 h 33 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 72917 change?

Yes. The 2012 USDA map put 72917 in zone 7b; the 2023 map puts it in zone 8a. The newer map uses 1991–2020 data and more weather stations.