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

Planting zone for 59330 — Glendive, MT

ZIP code 59330 (Glendive, Dawson County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is May 3 and the first fall frost October 4.

Where ZIP 59330 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 3
First frostOct 4
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 Glendive, MT…

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 Glendive, MT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 3median — 50% chance of a later frost
Safe for tender plantsMay 16only 10% chance of frost after
First fall frostOctober 4median — 10% chance by Sep 22
Growing season153 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 24 and returns around October 13.

From the NOAA station Glendive, MT — 2 miles away, elevation 2,077 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 59330

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 22 – Apr 5
SpinachSow outdoors · Mar 22 – Apr 12
Broccoli, cabbageStart indoors · Feb 22 – Mar 8
Broccoli, cabbageTransplant · Apr 12 – Apr 26
Onion setsPlant outdoors · Apr 5 – Apr 19
PotatoesPlant outdoors · Apr 12 – Apr 26
LettuceSow outdoors · Apr 5 – Apr 19
Carrots, beetsSow outdoors · Apr 12 – Apr 26
TomatoesStart indoors · Mar 8 – Mar 22
TomatoesTransplant · May 10 – May 24
Peppers, eggplantStart indoors · Feb 22 – Mar 8
Peppers, eggplantTransplant · May 17 – May 31
BeansSow outdoors · May 10 – May 24
Sweet cornSow outdoors · May 10 – May 24
Cucumbers, squashSow outdoors · May 10 – May 24
Fall lettuce, spinachSow outdoors · Aug 9 – Aug 23
GarlicPlant cloves · Sep 20 – Oct 25
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 3) and first fall frost (Oct 4) 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 59330 came on Mar 31 — 13 days earlier than the 1991–2020 average (Apr 13).

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 Montana

439 plants native to the lower 48 states, recorded in Montana, 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 elm120 ft · blooms early spring · medium shade tolerance · to −46 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fboxelder60 ft · blooms early spring · low shade tolerance · to −46 °FDouglas-fir200 ft · blooms mid spring · medium shade tolerance · to −33 °Feastern cottonwood190 ft · blooms spring · high shade tolerance · to −43 °F

Shrubs 77

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °Falderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °FBarclay's willow15 ft · high shade tolerance · to −43 °F

Wildflowers & perennials 189

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine mountainsorrel1 ft · blooms mid summer · medium shade tolerance · to −43 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °FAmerican bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °F

Grasses 141

Alaska oniongrass3 ft · blooms mid spring · low shade tolerance · to −33 °Falkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °FAlpine Meadow-Foxtail0.5 ft · blooms mid spring · medium shade tolerance · to −33 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °Fanalogue sedge1.5 ft · blooms late spring · medium shade tolerance · to −38 °F

Vines 3

American bittersweet15 ft · blooms spring · low 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 Glendive, MT.

Soil in Glendive, MT

The soil mapped at the center of ZIP 59330 is Benz — loam, well drained.

TextureLoama good balance for most vegetables
pH8.5alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Benz-Glendive complex, 2 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 59330; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Glendive, MT

Summer high88 °Faverage high, July
Winter low9 °Faverage low, January
Hot days38days a year at 90 °F or more
Freezing nights166nights a year at 32 °F or less
Growing degree days2,733base 50 °F — the season’s usable heat
Longest day15 h 55 mindaylight on June 21
Shortest day8 h 29 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation15.1 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 29 °F, low 9 °F 29°9° JanFebruary: average high 34 °F, low 13 °F 34°13° FebMarch: average high 46 °F, low 23 °F 46°23° MarApril: average high 59 °F, low 34 °F 59°34° AprMay: average high 69 °F, low 45 °F 69°45° MayJune: average high 79 °F, low 54 °F 79°54° JunJuly: average high 88 °F, low 60 °F 88°60° JulAugust: average high 87 °F, low 58 °F 87°58° AugSeptember: average high 76 °F, low 48 °F 76°48° SepOctober: average high 60 °F, low 36 °F 60°36° OctNovember: average high 44 °F, low 24 °F 44°24° NovDecember: average high 32 °F, low 13 °F 32°13° Dec

Precipitation by month inches

0″1″2″3″January: 0.34 in precipitation 0.3 JanFebruary: 0.36 in precipitation 0.4 FebMarch: 0.57 in precipitation 0.6 MarApril: 1.40 in precipitation 1.4 AprMay: 2.77 in precipitation 2.8 MayJune: 2.48 in precipitation 2.5 JunJuly: 2.25 in precipitation 2.3 JulAugust: 1.52 in precipitation 1.5 AugSeptember: 1.45 in precipitation 1.4 SepOctober: 1.16 in precipitation 1.2 OctNovember: 0.43 in precipitation 0.4 NovDecember: 0.39 in precipitation 0.4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Glendive, MT (2 mi away); precipitation: Glendive 2.2 W, MT (within 1 mile). 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.

593154a
Bloomfield, MT · 23 mi
593264a
Fallon, MT · 25 mi
593394b
Lindsay, MT · 25 mi
593534a
Wibaux, MT · 25 mi
592624a
Savage, MT · 28 mi
592174a
Crane, MT · 40 mi
593494a
Terry, MT · 41 mi
592594a
Richey, MT · 42 mi

Montana planting zones →

Questions about 59330

What planting zone is ZIP code 59330?

ZIP code 59330 (Glendive, MT) 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 Glendive, MT?

The median last spring frost (32 °F) near 59330 is May 3; after May 16 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Glendive station.

When is the first frost in Glendive, MT?

The median first fall frost near 59330 is October 4, giving a median frost-free growing season of 153 days.

When should I plant tomatoes in 59330?

Start tomato seeds indoors around Mar 8 – Mar 22 and set transplants outside around May 10 – May 24, one to three weeks after the median last frost.

How much rain and snow does 59330 get?

About 15.1 inches of precipitation a year (NOAA 1991–2020 normals, Glendive 2.2 W station).

How hot do summers get in Glendive, MT?

The average high peaks at 88 °F in July, with about 38 days a year at 90 °F or more.

What kind of soil does 59330 have?

The USDA soil survey maps Benz at the center of ZIP 59330: loam, well drained, pH about 8.5 (alkaline).

Did spring come early in Glendive, MT in 2026?

Spring leaf-out near 59330 came on Mar 31 in 2026, 13 days earlier than the 1991–2020 average (Apr 13), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Glendive, MT?

Long-day onions: the longest day near 59330 is 15 h 55 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).