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

Planting zone for 58369 — Saint John, ND

ZIP code 58369 (Saint John, Rolette County) is in USDA zone 3b: the coldest winter night averages −35 to −30 °F. The median last spring frost is May 19 and the first fall frost September 24.

Where ZIP 58369 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.

Zone3b−35 to −30 °F

Coldest night−37.2 to −34.4 °C

Last frostMay 19

First frostSep 24

2012 zone3b

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 3b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Saint John, 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 Saint John, ND

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 19median — 50% chance of a later frost

Safe for tender plantsJune 1only 10% chance of frost after

First fall frostSeptember 24median — 10% chance by Sep 10

Growing season126 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 9 and returns around October 2.

From the NOAA station Belcourt Keya Radio, ND — 9 miles away, elevation 1,959 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 58369

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 7 – Apr 21

SpinachSow outdoors · Apr 7 – Apr 28

Broccoli, cabbageStart indoors · Mar 10 – Mar 24

Broccoli, cabbageTransplant · Apr 28 – May 12

Onion setsPlant outdoors · Apr 21 – May 5

PotatoesPlant outdoors · Apr 28 – May 12

LettuceSow outdoors · Apr 21 – May 5

Carrots, beetsSow outdoors · Apr 28 – May 12

TomatoesStart indoors · Mar 24 – Apr 7

TomatoesTransplant · May 26 – Jun 9

Peppers, eggplantStart indoors · Mar 10 – Mar 24

Peppers, eggplantTransplant · Jun 2 – Jun 16

BeansSow outdoors · May 26 – Jun 9

Sweet cornSow outdoors · May 26 – Jun 9

Cucumbers, squashSow outdoors · May 26 – Jun 9

Fall lettuce, spinachSow outdoors · Jul 30 – Aug 13

GarlicPlant cloves · Sep 10 – Oct 15

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 19) and first fall frost (Sep 24) 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 58369 came on May 12 — 11 days later than the 1991–2020 average (May 1).

average
May 12026
May 12

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 3b in North Dakota

249 plants native to the lower 48 states, recorded in North Dakota, and rated by the USDA to survive −35 °F or colder — the bottom of zone 3b. Each links to its USDA PLANTS profile.

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 Saint John, ND.

Soil in Saint John, ND

The soil mapped at the center of ZIP 58369 is Kelvin — slightly decomposed plant material, well drained.

TextureSlightly decomposed plant materialtop layer

pH6.5neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter95%high

Hydrologic groupCwater soaks in slowly

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Kelvin loam, 3 to 9 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 58369; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Saint John, ND

Summer high79 °Faverage high, July

Winter low−5 °Faverage low, January

Hot days5days a year at 90 °F or more

Freezing nights209nights a year at 32 °F or less

Growing degree days1,783base 50 °F — the season’s usable heat

Longest day16 h 12 mindaylight on June 21

Shortest day8 h 14 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation20.1 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Belcourt Keya Radio, ND (9 mi away); precipitation: Belcourt Keya Radio, ND (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 3b.

Bottineau, ND · 27 mi

North Dakota planting zones →

Questions about 58369

What planting zone is ZIP code 58369?

ZIP code 58369 (Saint John, ND) is in USDA hardiness zone 3b on the 2023 map: the coldest night of an average winter reaches −35 to −30 °F (−37.2 to −34.4 °C).

When is the last frost in Saint John, ND?

The median last spring frost (32 °F) near 58369 is May 19; after June 1 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Belcourt Keya Radio station.

When is the first frost in Saint John, ND?

The median first fall frost near 58369 is September 24, giving a median frost-free growing season of 126 days.

When should I plant tomatoes in 58369?

Start tomato seeds indoors around Mar 24 – Apr 7 and set transplants outside around May 26 – Jun 9, one to three weeks after the median last frost.

How much rain and snow does 58369 get?

About 20.1 inches of precipitation a year (NOAA 1991–2020 normals, Belcourt Keya Radio station).

How hot do summers get in Saint John, ND?

The average high peaks at 79 °F in July, with about 5 days a year at 90 °F or more.

What kind of soil does 58369 have?

The USDA soil survey maps Kelvin at the center of ZIP 58369: slightly decomposed plant material, well drained, pH about 6.5 (neutral).

Did spring come early in Saint John, ND in 2026?

Spring leaf-out near 58369 came on May 12 in 2026, 11 days later than the 1991–2020 average (May 1), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Saint John, ND?

Long-day onions: the longest day near 58369 is 16 h 12 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).