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

Planting zone for 58356 — New Rockford, ND

ZIP code 58356 (New Rockford, Eddy County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is May 12 and the first fall frost September 27.

Where ZIP 58356 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 12
First frostSep 27
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 New Rockford, 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 New Rockford, ND

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 12median — 50% chance of a later frost
Safe for tender plantsMay 25only 10% chance of frost after
First fall frostSeptember 27median — 10% chance by Sep 17
Growing season137 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 4 and returns around October 5.

From the NOAA station Carrington 4 N, ND — 11 miles away, elevation 1,562 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 58356

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 31 – Apr 14
SpinachSow outdoors · Mar 31 – Apr 21
Broccoli, cabbageStart indoors · Mar 3 – Mar 17
Broccoli, cabbageTransplant · Apr 21 – May 5
Onion setsPlant outdoors · Apr 14 – Apr 28
PotatoesPlant outdoors · Apr 21 – May 5
LettuceSow outdoors · Apr 14 – Apr 28
Carrots, beetsSow outdoors · Apr 21 – May 5
TomatoesStart indoors · Mar 17 – Mar 31
TomatoesTransplant · May 19 – Jun 2
Peppers, eggplantStart indoors · Mar 3 – Mar 17
Peppers, eggplantTransplant · May 26 – Jun 9
BeansSow outdoors · May 19 – Jun 2
Sweet cornSow outdoors · May 19 – Jun 2
Cucumbers, squashSow outdoors · May 19 – Jun 2
Fall lettuce, spinachSow outdoors · Aug 2 – Aug 16
GarlicPlant cloves · Sep 13 – Oct 18
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 12) and first fall frost (Sep 27) 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 58356 came on Apr 26 — about the same time as the 1991–2020 average (Apr 24).

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).

Soil in New Rockford, ND

The soil mapped at the center of ZIP 58356 is Divide — loam, somewhat poorly drained.

TextureLoama good balance for most vegetables
pH7.9alkaline; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter3%moderate
Hydrologic groupCwater soaks in slowly
Farmland classprime farmlandUSDA classification

Map unit: Divide loam, loamy substratum, 0 to 2 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 58356; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in New Rockford, ND

Summer high82 °Faverage high, July
Winter low−1 °Faverage low, January
Hot days10days a year at 90 °F or more
Freezing nights190nights a year at 32 °F or less
Growing degree days2,159base 50 °F — the season’s usable heat
Longest day16 h 00 mindaylight on June 21
Shortest day8 h 25 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation20.8 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 18 °F, low -1 °F 18°−1° JanFebruary: average high 23 °F, low 2 °F 23°2° FebMarch: average high 36 °F, low 15 °F 36°15° MarApril: average high 53 °F, low 29 °F 53°29° AprMay: average high 67 °F, low 42 °F 67°42° MayJune: average high 76 °F, low 53 °F 76°53° JunJuly: average high 82 °F, low 57 °F 82°57° JulAugust: average high 81 °F, low 54 °F 81°54° AugSeptember: average high 72 °F, low 45 °F 72°45° SepOctober: average high 55 °F, low 32 °F 55°32° OctNovember: average high 37 °F, low 18 °F 37°18° NovDecember: average high 23 °F, low 5 °F 23°5° Dec

Precipitation by month inches

0″1″2″3″4″January: 0.53 in precipitation 0.5 JanFebruary: 0.42 in precipitation 0.4 FebMarch: 0.75 in precipitation 0.8 MarApril: 1.25 in precipitation 1.3 AprMay: 2.76 in precipitation 2.8 MayJune: 3.78 in precipitation 3.8 JunJuly: 3.60 in precipitation 3.6 JulAugust: 2.33 in precipitation 2.3 AugSeptember: 1.97 in precipitation 2.0 SepOctober: 1.90 in precipitation 1.9 OctNovember: 0.67 in precipitation 0.7 NovDecember: 0.81 in precipitation 0.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Carrington 4 N, ND (11 mi away); precipitation: Carrington 4 N, ND (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 4a.

583744a
Sheyenne, ND · 11 mi
584454a
Grace City, ND · 16 mi
584214a
Carrington, ND · 16 mi
584224a
Cathay, ND · 16 mi
583794a
Tokio, ND · 19 mi
583574a
Oberon, ND · 20 mi
583354a
Fort Totten, ND · 21 mi
583704a
Saint Michael, ND · 24 mi

North Dakota planting zones →

Questions about 58356

What planting zone is ZIP code 58356?

ZIP code 58356 (New Rockford, ND) 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 New Rockford, ND?

The median last spring frost (32 °F) near 58356 is May 12; after May 25 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Carrington 4 N station.

When is the first frost in New Rockford, ND?

The median first fall frost near 58356 is September 27, giving a median frost-free growing season of 137 days.

When should I plant tomatoes in 58356?

Start tomato seeds indoors around Mar 17 – Mar 31 and set transplants outside around May 19 – Jun 2, one to three weeks after the median last frost.

How much rain and snow does 58356 get?

About 20.8 inches of precipitation a year (NOAA 1991–2020 normals, Carrington 4 N station).

How hot do summers get in New Rockford, ND?

The average high peaks at 82 °F in July, with about 10 days a year at 90 °F or more.

What kind of soil does 58356 have?

The USDA soil survey maps Divide at the center of ZIP 58356: loam, somewhat poorly drained, pH about 7.9 (alkaline).

Did spring come early in New Rockford, ND in 2026?

Spring leaf-out near 58356 came on Apr 26 in 2026, about the same as the 1991–2020 average (Apr 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in New Rockford, ND?

Long-day onions: the longest day near 58356 is 16 h 00 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).