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

Planting zone for 58626 — Dunn Center, ND

ZIP code 58626 (Dunn Center, Dunn County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is May 20 and the first fall frost September 21.

Where ZIP 58626 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 20

First frostSep 21

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 Dunn Center, 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 Dunn Center, ND

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 20median — 50% chance of a later frost

Safe for tender plantsJune 1only 10% chance of frost after

First fall frostSeptember 21median — 10% chance by Sep 7

Growing season125 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 9 and returns around September 30.

From the NOAA station Dunn Center 1e, ND — 2 miles away, elevation 2,188 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 58626

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 8 – Apr 22

SpinachSow outdoors · Apr 8 – Apr 29

Broccoli, cabbageStart indoors · Mar 11 – Mar 25

Broccoli, cabbageTransplant · Apr 29 – May 13

Onion setsPlant outdoors · Apr 22 – May 6

PotatoesPlant outdoors · Apr 29 – May 13

LettuceSow outdoors · Apr 22 – May 6

Carrots, beetsSow outdoors · Apr 29 – May 13

TomatoesStart indoors · Mar 25 – Apr 8

TomatoesTransplant · May 27 – Jun 10

Peppers, eggplantStart indoors · Mar 11 – Mar 25

Peppers, eggplantTransplant · Jun 3 – Jun 17

BeansSow outdoors · May 27 – Jun 10

Sweet cornSow outdoors · May 27 – Jun 10

Cucumbers, squashSow outdoors · May 27 – Jun 10

Fall lettuce, spinachSow outdoors · Jul 27 – Aug 10

GarlicPlant cloves · Sep 7 – Oct 12

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 20) and first fall frost (Sep 21) 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 58626 came on Apr 17 — about the same time as the 1991–2020 average (Apr 18).

average
Apr 182026
Apr 17

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).

Soil in Dunn Center, ND

The soil mapped at the center of ZIP 58626 is Williams — loam, well drained.

TextureLoama good balance for most vegetables

pH7.2neutral; 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: Williams-Bowbells loams, 3 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 58626; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Dunn Center, ND

Summer high84 °Faverage high, July

Winter low0 °Faverage low, January

Hot days23days a year at 90 °F or more

Freezing nights194nights a year at 32 °F or less

Growing degree days2,038base 50 °F — the season’s usable heat

Longest day15 h 57 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)

Precipitation16.8 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: Dunn Center 1e, ND (2 mi away); precipitation: Dunn Center 1e, ND (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 4a.

Golden Valley, ND · 26 mi

586564a

Taylor, ND · 30 mi

North Dakota planting zones →

Questions about 58626

What planting zone is ZIP code 58626?

ZIP code 58626 (Dunn Center, 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 Dunn Center, ND?

The median last spring frost (32 °F) near 58626 is May 20; after June 1 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Dunn Center 1e station.

When is the first frost in Dunn Center, ND?

The median first fall frost near 58626 is September 21, giving a median frost-free growing season of 125 days.

When should I plant tomatoes in 58626?

Start tomato seeds indoors around Mar 25 – Apr 8 and set transplants outside around May 27 – Jun 10, one to three weeks after the median last frost.

How much rain and snow does 58626 get?

About 16.8 inches of precipitation a year (NOAA 1991–2020 normals, Dunn Center 1e station).

How hot do summers get in Dunn Center, ND?

The average high peaks at 84 °F in July, with about 23 days a year at 90 °F or more.

What kind of soil does 58626 have?

The USDA soil survey maps Williams at the center of ZIP 58626: loam, well drained, pH about 7.2 (neutral).

Did spring come early in Dunn Center, ND in 2026?

Spring leaf-out near 58626 came on Apr 17 in 2026, about the same as the 1991–2020 average (Apr 18), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Dunn Center, ND?

Long-day onions: the longest day near 58626 is 15 h 57 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).