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

Planting zone for 58425 — Cooperstown, ND

ZIP code 58425 (Cooperstown, Griggs County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is May 17 and the first fall frost September 23.

Where ZIP 58425 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 17
First frostSep 23
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 Cooperstown, 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 Cooperstown, ND

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 17median — 50% chance of a later frost
Safe for tender plantsJune 1only 10% chance of frost after
First fall frostSeptember 23median — 10% chance by Sep 10
Growing season128 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 7 and returns around October 2.

From the NOAA station Cooperstown, ND — 5 miles away, elevation 1,381 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 58425

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 5 – Apr 19
SpinachSow outdoors · Apr 5 – Apr 26
Broccoli, cabbageStart indoors · Mar 8 – Mar 22
Broccoli, cabbageTransplant · Apr 26 – May 10
Onion setsPlant outdoors · Apr 19 – May 3
PotatoesPlant outdoors · Apr 26 – May 10
LettuceSow outdoors · Apr 19 – May 3
Carrots, beetsSow outdoors · Apr 26 – May 10
TomatoesStart indoors · Mar 22 – Apr 5
TomatoesTransplant · May 24 – Jun 7
Peppers, eggplantStart indoors · Mar 8 – Mar 22
Peppers, eggplantTransplant · May 31 – Jun 14
BeansSow outdoors · May 24 – Jun 7
Sweet cornSow outdoors · May 24 – Jun 7
Cucumbers, squashSow outdoors · May 24 – Jun 7
Fall lettuce, spinachSow outdoors · Jul 29 – Aug 12
GarlicPlant cloves · Sep 9 – Oct 14
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 17) and first fall frost (Sep 23) 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 58425 came on Apr 24 — about the same time as the 1991–2020 average (Apr 24).

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 Cooperstown, ND.

Soil in Cooperstown, ND

The soil mapped at the center of ZIP 58425 is Svea — loam, moderately well drained.

TextureLoama good balance for most vegetables
pH7.0neutral; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter5.5%high
Hydrologic groupBwater soaks in moderately
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Svea-Cresbard loams, 0 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 58425; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Cooperstown, ND

Summer high79 °Faverage high, July
Winter low−3 °Faverage low, January
Hot days5days a year at 90 °F or more
Freezing nights188nights a year at 32 °F or less
Growing degree days1,929base 50 °F — the season’s usable heat
Longest day15 h 58 mindaylight on June 21
Shortest day8 h 27 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation22 inper year, rain and melted snow
Snowfall42 inper year

Average high and low, by month

−10°0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 16 °F, low -3 °F 16°−3° JanFebruary: average high 21 °F, low 1 °F 21°1° FebMarch: average high 34 °F, low 15 °F 34°15° MarApril: average high 52 °F, low 29 °F 52°29° AprMay: average high 66 °F, low 41 °F 66°41° MayJune: average high 75 °F, low 52 °F 75°52° JunJuly: average high 79 °F, low 56 °F 79°56° JulAugust: average high 78 °F, low 53 °F 78°53° AugSeptember: average high 69 °F, low 45 °F 69°45° SepOctober: average high 54 °F, low 32 °F 54°32° OctNovember: average high 36 °F, low 17 °F 36°17° NovDecember: average high 22 °F, low 4 °F 22°4° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″January: 0.47 in precipitation, 8.4 in snowfall 0.5❄8 JanFebruary: 0.63 in precipitation, 7 in snowfall 0.6❄7 FebMarch: 0.74 in precipitation, 7.5 in snowfall 0.7❄8 MarApril: 1.19 in precipitation, 2.5 in snowfall 1.2❄3 AprMay: 3.04 in precipitation, 0.1 in snowfall 3.0 MayJune: 3.43 in precipitation 3.4 JunJuly: 3.75 in precipitation 3.8 JulAugust: 3.16 in precipitation 3.2 AugSeptember: 2.09 in precipitation 2.1 SepOctober: 1.98 in precipitation, 1.1 in snowfall 2.0❄1 OctNovember: 0.78 in precipitation, 5.9 in snowfall 0.8❄6 NovDecember: 0.74 in precipitation, 9.7 in snowfall 0.7❄10 Dec

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

Nearby ZIP codes

All 8 nearest ZIP codes share zone 4a.

584524a
Jessie, ND · 8 mi
584484a
Hannaford, ND · 11 mi
584164a
Binford, ND · 13 mi
582304a
Finley, ND · 14 mi
584844a
Sutton, ND · 17 mi
580564a
Luverne, ND · 17 mi
584294a
Dazey, ND · 17 mi
582774a
Sharon, ND · 17 mi

North Dakota planting zones →

Questions about 58425

What planting zone is ZIP code 58425?

ZIP code 58425 (Cooperstown, 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 Cooperstown, ND?

The median last spring frost (32 °F) near 58425 is May 17; after June 1 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Cooperstown station.

When is the first frost in Cooperstown, ND?

The median first fall frost near 58425 is September 23, giving a median frost-free growing season of 128 days.

When should I plant tomatoes in 58425?

Start tomato seeds indoors around Mar 22 – Apr 5 and set transplants outside around May 24 – Jun 7, one to three weeks after the median last frost.

How much rain and snow does 58425 get?

About 22 inches of precipitation a year and 42 inches of snowfall (NOAA 1991–2020 normals, Cooperstown station).

How hot do summers get in Cooperstown, ND?

The average high peaks at 79 °F in July, with about 5 days a year at 90 °F or more.

What kind of soil does 58425 have?

The USDA soil survey maps Svea at the center of ZIP 58425: loam, moderately well drained, pH about 7.0 (neutral).

Did spring come early in Cooperstown, ND in 2026?

Spring leaf-out near 58425 came on Apr 24 in 2026, about the same as the 1991–2020 average (Apr 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Cooperstown, ND?

Long-day onions: the longest day near 58425 is 15 h 58 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).