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

Planting zone for 58032 — Forman, ND

ZIP code 58032 (Forman, Sargent County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is May 7 and the first fall frost October 1.

Where ZIP 58032 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.

Zone4a−30 to −25 °F
Coldest night−34.4 to −31.7 °C
Last frostMay 7
First frostOct 1
2012 zone4a

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 4a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Forman, ND…

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 Forman, ND

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 7median — 50% chance of a later frost
Safe for tender plantsMay 20only 10% chance of frost after
First fall frostOctober 1median — 10% chance by Sep 18
Growing season146 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 29 and returns around October 9.

From the NOAA station Forman 5 Sse, ND — 4 miles away, elevation 1,250 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 58032

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 26 – Apr 9
SpinachSow outdoors · Mar 26 – Apr 16
Broccoli, cabbageStart indoors · Feb 26 – Mar 12
Broccoli, cabbageTransplant · Apr 16 – Apr 30
Onion setsPlant outdoors · Apr 9 – Apr 23
PotatoesPlant outdoors · Apr 16 – Apr 30
LettuceSow outdoors · Apr 9 – Apr 23
Carrots, beetsSow outdoors · Apr 16 – Apr 30
TomatoesStart indoors · Mar 12 – Mar 26
TomatoesTransplant · May 14 – May 28
Peppers, eggplantStart indoors · Feb 26 – Mar 12
Peppers, eggplantTransplant · May 21 – Jun 4
BeansSow outdoors · May 14 – May 28
Sweet cornSow outdoors · May 14 – May 28
Cucumbers, squashSow outdoors · May 14 – May 28
Fall lettuce, spinachSow outdoors · Aug 6 – Aug 20
GarlicPlant cloves · Sep 17 – Oct 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 7) and first fall frost (Oct 1) 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 58032 came on Apr 21 — about the same time as the 1991–2020 average (Apr 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 4a in North Dakota

342 plants native to the lower 48 states, recorded in North Dakota, and rated by the USDA to survive −30 °F or colder — the bottom of zone 4a. Each links to its USDA PLANTS profile.

Trees 21

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fbigtooth aspen65 ft · blooms mid spring · high shade tolerance · to −43 °Fblack ash65 ft · blooms early spring · high shade tolerance · to −47 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °F

Shrubs 56

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fbeaked hazelnut15 ft · blooms early spring · low shade tolerance · to −47 °Fbig sagebrush4 ft · blooms mid summer · high shade tolerance · to −43 °F

Wildflowers & perennials 146

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican speedwell0.8 ft · blooms mid summer · low shade tolerance · to −38 °F

Grasses 110

alkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °Fanalogue sedge1.5 ft · blooms late spring · medium shade tolerance · to −38 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBebb's sedge3 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 4

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fwestern white clematis1 ft · blooms mid summer · medium shade tolerance · to −38 °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 Forman, ND.

Soil in Forman, ND

The soil mapped at the center of ZIP 58032 is Forman — loam, well drained.

TextureLoama good balance for most vegetables
pH7.0neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter4%moderate
Hydrologic groupCwater soaks in slowly
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Forman-Aastad-Parnell complex, 0 to 6 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 58032; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Forman, ND

Summer high81 °Faverage high, July
Winter low−1 °Faverage low, January
Hot days9days a year at 90 °F or more
Freezing nights179nights a year at 32 °F or less
Growing degree days2,264base 50 °F — the season’s usable heat
Longest day15 h 46 mindaylight on June 21
Shortest day8 h 38 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation23.2 inper year, rain and melted snow

Average high and low, by month

−10°0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 18 °F, low -1 °F 18°−1° JanFebruary: average high 23 °F, low 3 °F 23°3° FebMarch: average high 37 °F, low 17 °F 37°17° MarApril: average high 53 °F, low 31 °F 53°31° AprMay: average high 66 °F, low 44 °F 66°44° MayJune: average high 76 °F, low 55 °F 76°55° JunJuly: average high 81 °F, low 59 °F 81°59° JulAugust: average high 80 °F, low 57 °F 80°57° AugSeptember: average high 71 °F, low 47 °F 71°47° SepOctober: average high 56 °F, low 34 °F 56°34° OctNovember: average high 38 °F, low 20 °F 38°20° NovDecember: average high 25 °F, low 7 °F 25°7° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 0.67 in precipitation 0.7 JanFebruary: 0.52 in precipitation 0.5 FebMarch: 0.96 in precipitation 1.0 MarApril: 1.85 in precipitation 1.9 AprMay: 2.83 in precipitation 2.8 MayJune: 4.31 in precipitation 4.3 JunJuly: 3.60 in precipitation 3.6 JulAugust: 2.21 in precipitation 2.2 AugSeptember: 2.53 in precipitation 2.5 SepOctober: 2.23 in precipitation 2.2 OctNovember: 0.82 in precipitation 0.8 NovDecember: 0.64 in precipitation 0.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Forman 5 Sse, ND (4 mi away); precipitation: Forman 5 Sse, ND (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

580674a
Rutland, ND · 7 mi
580404a
Gwinner, ND · 8 mi
580434a
Havana, ND · 9 mi
580174a
Cogswell, ND · 10 mi
580134b
Cayuga, ND · 15 mi
580694a
Stirum, ND · 15 mi
574304a
Britton, SD · 17 mi
580604a
Milnor, ND · 17 mi

North Dakota planting zones →

Questions about 58032

What planting zone is ZIP code 58032?

ZIP code 58032 (Forman, ND) is in USDA hardiness zone 4a on the 2023 map: the coldest night of an average winter reaches −30 to −25 °F (−34.4 to −31.7 °C).

When is the last frost in Forman, ND?

The median last spring frost (32 °F) near 58032 is May 7; after May 20 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Forman 5 Sse station.

When is the first frost in Forman, ND?

The median first fall frost near 58032 is October 1, giving a median frost-free growing season of 146 days.

When should I plant tomatoes in 58032?

Start tomato seeds indoors around Mar 12 – Mar 26 and set transplants outside around May 14 – May 28, one to three weeks after the median last frost.

How much rain and snow does 58032 get?

About 23.2 inches of precipitation a year (NOAA 1991–2020 normals, Forman 5 Sse station).

How hot do summers get in Forman, ND?

The average high peaks at 81 °F in July, with about 9 days a year at 90 °F or more.

What kind of soil does 58032 have?

The USDA soil survey maps Forman at the center of ZIP 58032: loam, well drained, pH about 7.0 (neutral).

Did spring come early in Forman, ND in 2026?

Spring leaf-out near 58032 came on Apr 21 in 2026, about the same as the 1991–2020 average (Apr 20), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Forman, ND?

Long-day onions: the longest day near 58032 is 15 h 46 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).