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

Planting zone for 58622 — Belfield, ND

ZIP code 58622 (Belfield, Stark County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 9 and the first fall frost September 30.

Where ZIP 58622 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.

Zone4b−25 to −20 °F

Coldest night−31.7 to −28.9 °C

Last frostMay 9

First frostSep 30

2012 zone4a

Was 4a 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 4b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Belfield, 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 Belfield, ND

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 9median — 50% chance of a later frost

Safe for tender plantsMay 21only 10% chance of frost after

First fall frostSeptember 30median — 10% chance by Sep 15

Growing season142 daysfrost-free, median

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

From the NOAA station Medora 7 E, ND — 6 miles away, elevation 2,772 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 58622

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 28 – Apr 11

SpinachSow outdoors · Mar 28 – Apr 18

Broccoli, cabbageStart indoors · Feb 28 – Mar 14

Broccoli, cabbageTransplant · Apr 18 – May 2

Onion setsPlant outdoors · Apr 11 – Apr 25

PotatoesPlant outdoors · Apr 18 – May 2

LettuceSow outdoors · Apr 11 – Apr 25

Carrots, beetsSow outdoors · Apr 18 – May 2

TomatoesStart indoors · Mar 14 – Mar 28

TomatoesTransplant · May 16 – May 30

Peppers, eggplantStart indoors · Feb 28 – Mar 14

Peppers, eggplantTransplant · May 23 – Jun 6

BeansSow outdoors · May 16 – May 30

Sweet cornSow outdoors · May 16 – May 30

Cucumbers, squashSow outdoors · May 16 – May 30

Fall lettuce, spinachSow outdoors · Aug 5 – Aug 19

GarlicPlant cloves · Sep 16 – Oct 21

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 9) and first fall frost (Sep 30) 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 58622 came on Apr 8 — 9 days earlier than the 1991–2020 average (Apr 17).

average
Apr 172026
Apr 8

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 4b in North Dakota

372 plants native to the lower 48 states, recorded in North Dakota, and rated by the USDA to survive −25 °F or colder — the bottom of zone 4b. 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 Belfield, ND.

Soil in Belfield, ND

The soil mapped at the center of ZIP 58622 is Sen — silt loam, well drained.

TextureSilt loama good balance for most vegetables

pH7.4slightly alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupCwater soaks in slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Sen-Janesburg silt 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 58622; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Belfield, ND

Summer high82 °Faverage high, July

Winter low9 °Faverage low, January

Hot days17days a year at 90 °F or more

Freezing nights173nights a year at 32 °F or less

Growing degree days2,157base 50 °F — the season’s usable heat

Longest day15 h 53 mindaylight on June 21

Shortest day8 h 31 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation17.4 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: Medora 7 E, ND (6 mi away); precipitation: Medora 7 E, ND (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

586554b

South Heart, ND · 13 mi

586454a

Medora, ND · 15 mi

586014b

Dickinson, ND · 20 mi

586024a

Dickinson, ND · 22 mi

586274a

Fairfield, ND · 25 mi

586204b

Amidon, ND · 26 mi

586544a

Sentinel Butte, ND · 28 mi

586474b

New England, ND · 29 mi

North Dakota planting zones →

Questions about 58622

What planting zone is ZIP code 58622?

ZIP code 58622 (Belfield, ND) is in USDA hardiness zone 4b on the 2023 map: the coldest night of an average winter reaches −25 to −20 °F (−31.7 to −28.9 °C).

When is the last frost in Belfield, ND?

The median last spring frost (32 °F) near 58622 is May 9; after May 21 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Medora 7 E station.

When is the first frost in Belfield, ND?

The median first fall frost near 58622 is September 30, giving a median frost-free growing season of 142 days.

When should I plant tomatoes in 58622?

Start tomato seeds indoors around Mar 14 – Mar 28 and set transplants outside around May 16 – May 30, one to three weeks after the median last frost.

How much rain and snow does 58622 get?

About 17.4 inches of precipitation a year (NOAA 1991–2020 normals, Medora 7 E station).

How hot do summers get in Belfield, ND?

The average high peaks at 82 °F in July, with about 17 days a year at 90 °F or more.

What kind of soil does 58622 have?

The USDA soil survey maps Sen at the center of ZIP 58622: silt loam, well drained, pH about 7.4 (slightly alkaline).

Did spring come early in Belfield, ND in 2026?

Spring leaf-out near 58622 came on Apr 8 in 2026, 9 days earlier than the 1991–2020 average (Apr 17), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Belfield, ND?

Long-day onions: the longest day near 58622 is 15 h 53 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 58622 change?

Yes. The 2012 USDA map put 58622 in zone 4a; the 2023 map puts it in zone 4b. The newer map uses 1991–2020 data and more weather stations.