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

Planting zone for 58630 — Gladstone, ND

ZIP code 58630 (Gladstone, Stark County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is May 23 and the first fall frost September 20.

Where ZIP 58630 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 23

First frostSep 20

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 Gladstone, 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 Gladstone, ND

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 23median — 50% chance of a later frost

Safe for tender plantsJune 5only 10% chance of frost after

First fall frostSeptember 20median — 10% chance by Sep 4

Growing season119 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 13 and returns around September 28.

From the NOAA station Taylor 7 Nnw, ND — 7 miles away, elevation 2,221 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 58630

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 11 – Apr 25

SpinachSow outdoors · Apr 11 – May 2

Broccoli, cabbageStart indoors · Mar 14 – Mar 28

Broccoli, cabbageTransplant · May 2 – May 16

Onion setsPlant outdoors · Apr 25 – May 9

PotatoesPlant outdoors · May 2 – May 16

LettuceSow outdoors · Apr 25 – May 9

Carrots, beetsSow outdoors · May 2 – May 16

TomatoesStart indoors · Mar 28 – Apr 11

TomatoesTransplant · May 30 – Jun 13

Peppers, eggplantStart indoors · Mar 14 – Mar 28

Peppers, eggplantTransplant · Jun 6 – Jun 20

BeansSow outdoors · May 30 – Jun 13

Sweet cornSow outdoors · May 30 – Jun 13

Cucumbers, squashSow outdoors · May 30 – Jun 13

Fall lettuce, spinachSow outdoors · Jul 26 – Aug 9

GarlicPlant cloves · Sep 6 – Oct 11

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 23) and first fall frost (Sep 20) 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 58630 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 Gladstone, ND

The soil mapped at the center of ZIP 58630 is Amor — loam, well drained.

TextureLoama good balance for most vegetables

pH6.5neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter4%moderate

Hydrologic groupCwater soaks in slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Amor-Cabba loams, 9 to 15 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 58630; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Gladstone, ND

Summer high84 °Faverage high, July

Winter low4 °Faverage low, January

Hot days24days a year at 90 °F or more

Freezing nights192nights a year at 32 °F or less

Growing degree days2,082base 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)

Precipitation16.2 inper year, rain and melted snow

Snowfall35 inper year; 69 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Taylor 7 Nnw, ND (7 mi away); precipitation: Taylor 7 Nnw, ND (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

586564a

Taylor, ND · 5 mi

586024a

Dickinson, ND · 11 mi

586014b

Dickinson, ND · 12 mi

586524a

Richardton, ND · 16 mi

South Heart, ND · 24 mi

North Dakota planting zones →

Questions about 58630

What planting zone is ZIP code 58630?

ZIP code 58630 (Gladstone, 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 Gladstone, ND?

The median last spring frost (32 °F) near 58630 is May 23; after June 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Taylor 7 Nnw station.

When is the first frost in Gladstone, ND?

The median first fall frost near 58630 is September 20, giving a median frost-free growing season of 119 days.

When should I plant tomatoes in 58630?

Start tomato seeds indoors around Mar 28 – Apr 11 and set transplants outside around May 30 – Jun 13, one to three weeks after the median last frost.

How much rain and snow does 58630 get?

About 16.2 inches of precipitation a year and 35 inches of snowfall (NOAA 1991–2020 normals, Taylor 7 Nnw station).

How hot do summers get in Gladstone, ND?

The average high peaks at 84 °F in July, with about 24 days a year at 90 °F or more.

What kind of soil does 58630 have?

The USDA soil survey maps Amor at the center of ZIP 58630: loam, well drained, pH about 6.5 (neutral).

Did spring come early in Gladstone, ND in 2026?

Spring leaf-out near 58630 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 Gladstone, ND?

Long-day onions: the longest day near 58630 is 15 h 53 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).