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

Planting zone for 59732 — Glen, MT

ZIP code 59732 (Glen, Beaverhead County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is June 10 and the first fall frost September 7.

Where ZIP 59732 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 frostJun 10
First frostSep 7
2012 zone4b

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 4b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Glen, 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 Glen, MT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostJune 10median — 50% chance of a later frost
Safe for tender plantsJuly 2only 10% chance of frost after
First fall frostSeptember 7median — 10% chance by Aug 24
Growing season85 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 21 and returns around September 19.

From the NOAA station Divide, MT — 17 miles away, elevation 5,351 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 59732

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 29 – May 13
SpinachSow outdoors · Apr 29 – May 20
Broccoli, cabbageStart indoors · Apr 1 – Apr 15
Broccoli, cabbageTransplant · May 20 – Jun 3
Onion setsPlant outdoors · May 13 – May 27
PotatoesPlant outdoors · May 20 – Jun 3
LettuceSow outdoors · May 13 – May 27
Carrots, beetsSow outdoors · May 20 – Jun 3
TomatoesStart indoors · Apr 15 – Apr 29
TomatoesTransplant · Jun 17 – Jul 1
Peppers, eggplantStart indoors · Apr 1 – Apr 15
Peppers, eggplantTransplant · Jun 24 – Jul 8
BeansSow outdoors · Jun 17 – Jul 1
Sweet cornSow outdoors · Jun 17 – Jul 1
Cucumbers, squashSow outdoors · Jun 17 – Jul 1
Fall lettuce, spinachSow outdoors · Jul 13 – Jul 27
GarlicPlant cloves · Aug 24 – Sep 28
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 10) and first fall frost (Sep 7) 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 59732 came on Mar 23 — 28 days earlier than the 1991–2020 average (Apr 20).

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 Montana

506 plants native to the lower 48 states, recorded in Montana, and rated by the USDA to survive −25 °F or colder — the bottom of zone 4b. Each links to its USDA PLANTS profile.

Trees 23

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 87

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °Falderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °Falpine laurel1 ft · blooms late spring · low shade tolerance · to −28 °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 °F

Wildflowers & perennials 229

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 alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °F

Grasses 155

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 Glen, MT.

Soil in Glen, MT

The soil mapped at the center of ZIP 59732 is Riverrun — gravelly sandy loam, moderately well drained.

TextureGravelly sandy loamdrains and warms fast; dries out and needs more feeding
pH7.3neutral; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classFarmland of local importanceUSDA classification

Map unit: Riverrun, frequently flooded-Beavrock, occasionally flooded complex, 0 to 4 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 59732; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Glen, MT

Summer high86 °Faverage high, July
Winter low8 °Faverage low, January
Hot days22days a year at 90 °F or more
Freezing nights213nights a year at 32 °F or less
Growing degree days1,422base 50 °F — the season’s usable heat
Longest day15 h 41 mindaylight on June 21
Shortest day8 h 42 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation9.2 inper year, rain and melted snow
Snowfall10 inper year; 29 days with snow on the ground

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 37 °F, low 8 °F 37°8° JanFebruary: average high 41 °F, low 11 °F 41°11° FebMarch: average high 50 °F, low 19 °F 50°19° MarApril: average high 58 °F, low 26 °F 58°26° AprMay: average high 68 °F, low 33 °F 68°33° MayJune: average high 76 °F, low 40 °F 76°40° JunJuly: average high 86 °F, low 44 °F 86°44° JulAugust: average high 85 °F, low 41 °F 85°41° AugSeptember: average high 76 °F, low 33 °F 76°33° SepOctober: average high 61 °F, low 25 °F 61°25° OctNovember: average high 45 °F, low 15 °F 45°15° NovDecember: average high 36 °F, low 8 °F 36°8° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″January: 0.24 in precipitation, 2 in snowfall 0.2❄2 JanFebruary: 0.39 in precipitation, 1.2 in snowfall 0.4❄1 FebMarch: 0.47 in precipitation, 1.2 in snowfall 0.5❄1 MarApril: 0.83 in precipitation, 1.1 in snowfall 0.8❄1 AprMay: 1.74 in precipitation 1.7 MayJune: 1.67 in precipitation 1.7 JunJuly: 0.83 in precipitation 0.8 JulAugust: 0.85 in precipitation 0.8 AugSeptember: 0.71 in precipitation 0.7 SepOctober: 0.68 in precipitation, 0.3 in snowfall 0.7 OctNovember: 0.46 in precipitation, 1.8 in snowfall 0.5❄2 NovDecember: 0.31 in precipitation, 2.5 in snowfall 0.3❄3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Glen 4 N, MT (2 mi away); precipitation: Glen 4 N, MT (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

597435a
Melrose, MT · 8 mi
597545a
Twin Bridges, MT · 16 mi
597465a
Polaris, MT · 19 mi
597275a
Divide, MT · 22 mi
597515a
Silver Star, MT · 23 mi
597024a
Butte, MT · 28 mi
597034a
Butte, MT · 28 mi
597505a
Butte, MT · 29 mi

Montana planting zones →

Questions about 59732

What planting zone is ZIP code 59732?

ZIP code 59732 (Glen, MT) 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 Glen, MT?

The median last spring frost (32 °F) near 59732 is June 10; after July 2 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Divide station.

When is the first frost in Glen, MT?

The median first fall frost near 59732 is September 7, giving a median frost-free growing season of 85 days.

When should I plant tomatoes in 59732?

Start tomato seeds indoors around Apr 15 – Apr 29 and set transplants outside around Jun 17 – Jul 1, one to three weeks after the median last frost.

How much rain and snow does 59732 get?

About 9.2 inches of precipitation a year and 10 inches of snowfall (NOAA 1991–2020 normals, Glen 4 N station).

How hot do summers get in Glen, MT?

The average high peaks at 86 °F in July, with about 22 days a year at 90 °F or more.

What kind of soil does 59732 have?

The USDA soil survey maps Riverrun at the center of ZIP 59732: gravelly sandy loam, moderately well drained, pH about 7.3 (neutral).

Did spring come early in Glen, MT in 2026?

Spring leaf-out near 59732 came on Mar 23 in 2026, 28 days earlier than the 1991–2020 average (Apr 20), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Glen, MT?

Long-day onions: the longest day near 59732 is 15 h 41 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).