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

Planting zone for 59222 — Flaxville, MT

ZIP code 59222 (Flaxville, Daniels County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is May 28 and the first fall frost September 7.

Where ZIP 59222 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 28
First frostSep 7
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 Flaxville, 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 Flaxville, MT

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 28median — 50% chance of a later frost
Safe for tender plantsJune 13only 10% chance of frost after
First fall frostSeptember 7median — 10% chance by Aug 22
Growing season101 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 18 and returns around September 16.

From the NOAA station Redstone, MT — 13 miles away, elevation 2,106 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 59222

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 16 – Apr 30
SpinachSow outdoors · Apr 16 – May 7
Broccoli, cabbageStart indoors · Mar 19 – Apr 2
Broccoli, cabbageTransplant · May 7 – May 21
Onion setsPlant outdoors · Apr 30 – May 14
PotatoesPlant outdoors · May 7 – May 21
LettuceSow outdoors · Apr 30 – May 14
Carrots, beetsSow outdoors · May 7 – May 21
TomatoesStart indoors · Apr 2 – Apr 16
TomatoesTransplant · Jun 4 – Jun 18
Peppers, eggplantStart indoors · Mar 19 – Apr 2
Peppers, eggplantTransplant · Jun 11 – Jun 25
BeansSow outdoors · Jun 4 – Jun 18
Sweet cornSow outdoors · Jun 4 – Jun 18
Cucumbers, squashSow outdoors · Jun 4 – Jun 18
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 (May 28) 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 59222 came on Apr 21 — about the same time as the 1991–2020 average (Apr 22).

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 Flaxville, MT.

Soil in Flaxville, MT

The soil mapped at the center of ZIP 59222 is Cabba — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH8.2alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Cabba-Cambert-Cherry silt loams, 8 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 59222; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Flaxville, MT

Summer high82 °Faverage high, July
Winter low−1 °Faverage low, January
Hot days23days a year at 90 °F or more
Freezing nights209nights a year at 32 °F or less
Growing degree days1,725base 50 °F — the season’s usable heat
Longest day16 h 09 mindaylight on June 21
Shortest day8 h 16 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation14.3 inper year, rain and melted snow

Average high and low, by month

−10°0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 24 °F, low -1 °F 24°−1° JanFebruary: average high 26 °F, low 4 °F 26°4° FebMarch: average high 39 °F, low 15 °F 39°15° MarApril: average high 56 °F, low 26 °F 56°26° AprMay: average high 67 °F, low 37 °F 67°37° MayJune: average high 75 °F, low 47 °F 75°47° JunJuly: average high 82 °F, low 51 °F 82°51° JulAugust: average high 82 °F, low 49 °F 82°49° AugSeptember: average high 72 °F, low 38 °F 72°38° SepOctober: average high 55 °F, low 27 °F 55°27° OctNovember: average high 38 °F, low 14 °F 38°14° NovDecember: average high 26 °F, low 3 °F 26°3° Dec

Precipitation by month inches

0″1″2″3″4″January: 0.42 in precipitation 0.4 JanFebruary: 0.24 in precipitation 0.2 FebMarch: 0.67 in precipitation 0.7 MarApril: 0.86 in precipitation 0.9 AprMay: 2.22 in precipitation 2.2 MayJune: 3.08 in precipitation 3.1 JunJuly: 2.14 in precipitation 2.1 JulAugust: 1.80 in precipitation 1.8 AugSeptember: 0.97 in precipitation 1.0 SepOctober: 0.88 in precipitation 0.9 OctNovember: 0.43 in precipitation 0.4 NovDecember: 0.57 in precipitation 0.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Redstone, MT (13 mi away); precipitation: Redstone, MT (13 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

592573b
Redstone, MT · 11 mi
592633b
Scobey, MT · 17 mi
592763b
Whitetail, MT · 18 mi
592523b
Outlook, MT · 22 mi
592543b
Plentywood, MT · 24 mi
592583b
Reserve, MT · 24 mi
592564a
Raymond, MT · 31 mi
592473b
Medicine Lake, MT · 32 mi

Montana planting zones →

Questions about 59222

What planting zone is ZIP code 59222?

ZIP code 59222 (Flaxville, 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 Flaxville, MT?

The median last spring frost (32 °F) near 59222 is May 28; after June 13 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Redstone station.

When is the first frost in Flaxville, MT?

The median first fall frost near 59222 is September 7, giving a median frost-free growing season of 101 days.

When should I plant tomatoes in 59222?

Start tomato seeds indoors around Apr 2 – Apr 16 and set transplants outside around Jun 4 – Jun 18, one to three weeks after the median last frost.

How much rain and snow does 59222 get?

About 14.3 inches of precipitation a year (NOAA 1991–2020 normals, Redstone station).

How hot do summers get in Flaxville, MT?

The average high peaks at 82 °F in July, with about 23 days a year at 90 °F or more.

What kind of soil does 59222 have?

The USDA soil survey maps Cabba at the center of ZIP 59222: silt loam, well drained, pH about 8.2 (alkaline).

Did spring come early in Flaxville, MT in 2026?

Spring leaf-out near 59222 came on Apr 21 in 2026, about the same as the 1991–2020 average (Apr 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Flaxville, MT?

Long-day onions: the longest day near 59222 is 16 h 09 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).