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

Planting zone for Jamestown, ND

Jamestown, ND is in USDA zones 4a to 4b across its 3 ZIP codes. The median last spring frost is May 8 and the first fall frost September 29.

Jamestown on the zone map

Outlined: its 3 ZIP code areas · 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.

Zones4a–4b−30 to −20 °F
ZIP codes3
Last frostMay 8
First frostSep 29
Growing season143 days

4a 1 ZIP   4b 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Jamestown, 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 Jamestown, ND

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 8median — 50% chance of a later frost
Safe for tender plantsMay 21only 10% chance of frost after
First fall frostSeptember 29median — 10% chance by Sep 17
Growing season143 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 30 and returns around October 7.

From the NOAA station Jamestown State Hosp, ND, elevation 1,467 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 Jamestown

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 27 – Apr 10
SpinachSow outdoors · Mar 27 – Apr 17
Broccoli, cabbageStart indoors · Feb 27 – Mar 13
Broccoli, cabbageTransplant · Apr 17 – May 1
Onion setsPlant outdoors · Apr 10 – Apr 24
PotatoesPlant outdoors · Apr 17 – May 1
LettuceSow outdoors · Apr 10 – Apr 24
Carrots, beetsSow outdoors · Apr 17 – May 1
TomatoesStart indoors · Mar 13 – Mar 27
TomatoesTransplant · May 15 – May 29
Peppers, eggplantStart indoors · Feb 27 – Mar 13
Peppers, eggplantTransplant · May 22 – Jun 5
BeansSow outdoors · May 15 – May 29
Sweet cornSow outdoors · May 15 – May 29
Cucumbers, squashSow outdoors · May 15 – May 29
Fall lettuce, spinachSow outdoors · Aug 4 – Aug 18
GarlicPlant cloves · Sep 15 – Oct 20
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 8) and first fall frost (Sep 29) 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 58402 came on Apr 22 — 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 North Dakota

342 plants native to the lower 48 states, recorded in North Dakota, 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 basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fbigtooth aspen65 ft · blooms mid spring · high shade tolerance · to −43 °Fblack ash65 ft · blooms early spring · high shade tolerance · to −47 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °F

Shrubs 56

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fbeaked hazelnut15 ft · blooms early spring · low shade tolerance · to −47 °Fbig sagebrush4 ft · blooms mid summer · high shade tolerance · to −43 °F

Wildflowers & perennials 146

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican speedwell0.8 ft · blooms mid summer · low shade tolerance · to −38 °F

Grasses 110

alkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °Fanalogue sedge1.5 ft · blooms late spring · medium shade tolerance · to −38 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBebb's sedge3 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 4

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium 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 Jamestown, ND.

Soil in Jamestown, ND

The soil mapped at the center of ZIP 58402 is Barnes — loam, well drained.

TextureLoama good balance for most vegetables
pH7.0neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter4%moderate
Hydrologic groupBwater soaks in moderately
Farmland classprime farmlandUSDA classification

Map unit: Barnes-Svea loams, 0 to 3 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 58402; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Jamestown, ND

Summer high82 °Faverage high, July
Winter low0 °Faverage low, January
Hot days11days a year at 90 °F or more
Freezing nights181nights a year at 32 °F or less
Growing degree days2,209base 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)
Precipitation21.1 inper year, rain and melted snow
Snowfall46 inper year

Average high and low, by month

−10°0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 18 °F, low 0 °F 18°0° JanFebruary: average high 23 °F, low 4 °F 23°4° FebMarch: average high 36 °F, low 17 °F 36°17° MarApril: average high 53 °F, low 29 °F 53°29° AprMay: average high 67 °F, low 43 °F 67°43° MayJune: average high 77 °F, low 54 °F 77°54° JunJuly: average high 82 °F, low 59 °F 82°59° JulAugust: average high 80 °F, low 56 °F 80°56° AugSeptember: average high 71 °F, low 46 °F 71°46° SepOctober: average high 55 °F, low 33 °F 55°33° OctNovember: average high 38 °F, low 19 °F 38°19° NovDecember: average high 24 °F, low 8 °F 24°8° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″January: 0.50 in precipitation, 11.4 in snowfall 0.5❄11 JanFebruary: 0.46 in precipitation, 7.4 in snowfall 0.5❄7 FebMarch: 0.74 in precipitation, 6.5 in snowfall 0.7❄7 MarApril: 1.22 in precipitation, 2.5 in snowfall 1.2❄3 AprMay: 3.44 in precipitation, 0.4 in snowfall 3.4 MayJune: 3.62 in precipitation 3.6 JunJuly: 3.59 in precipitation 3.6 JulAugust: 2.28 in precipitation 2.3 AugSeptember: 2.24 in precipitation 2.2 SepOctober: 1.89 in precipitation, 1.9 in snowfall 1.9❄2 OctNovember: 0.52 in precipitation, 4.2 in snowfall 0.5❄4 NovDecember: 0.62 in precipitation, 11.8 in snowfall 0.6❄12 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Jamestown State Hosp, ND (within 1 mile); precipitation: Jamestown State Hosp, ND (within 1 mile). Daylight is calculated from latitude.

ZIP codes in Jamestown

584014b
−25 to −20 °F
584024a
−30 to −25 °F
584054b
−25 to −20 °F

North Dakota planting zones →

Questions about Jamestown

What planting zone is Jamestown, ND?

Jamestown, ND is in USDA hardiness zones 4a to 4b on the 2023 map (4a: −30 to −25 °F; 4b: −25 to −20 °F).

When is the last frost in Jamestown, ND?

The median last spring frost is May 8 and the median first fall frost is September 29 (NOAA 1991–2020 normals, Jamestown State Hosp station).

When can I plant a garden in Jamestown, ND?

Cool-season crops like peas and spinach go in around Mar 27 – Apr 17; tomatoes, peppers, beans and squash after about May 15, once frost risk has passed.

What kind of onions grow in Jamestown, ND?

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

How much rain and snow does Jamestown, ND get?

About 21.1 inches of precipitation a year and 46 inches of snowfall (NOAA 1991–2020 normals).