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

Planting zone for 56738 — Newfolden, MN

ZIP code 56738 (Newfolden, Marshall County) is in USDA zone 3b: the coldest winter night averages −35 to −30 °F. The median last spring frost is May 14 and the first fall frost September 28.

Where ZIP 56738 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 14

First frostSep 28

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 Newfolden, MN…

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 Newfolden, MN

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 14median — 50% chance of a later frost

Safe for tender plantsMay 29only 10% chance of frost after

First fall frostSeptember 28median — 10% chance by Sep 14

Growing season135 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 5 and returns around October 8.

From the NOAA station Thief Rvr Falls 2, MN — 16 miles away, elevation 1,129 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 56738

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 2 – Apr 16

SpinachSow outdoors · Apr 2 – Apr 23

Broccoli, cabbageStart indoors · Mar 5 – Mar 19

Broccoli, cabbageTransplant · Apr 23 – May 7

Onion setsPlant outdoors · Apr 16 – Apr 30

PotatoesPlant outdoors · Apr 23 – May 7

LettuceSow outdoors · Apr 16 – Apr 30

Carrots, beetsSow outdoors · Apr 23 – May 7

TomatoesStart indoors · Mar 19 – Apr 2

TomatoesTransplant · May 21 – Jun 4

Peppers, eggplantStart indoors · Mar 5 – Mar 19

Peppers, eggplantTransplant · May 28 – Jun 11

BeansSow outdoors · May 21 – Jun 4

Sweet cornSow outdoors · May 21 – Jun 4

Cucumbers, squashSow outdoors · May 21 – Jun 4

Fall lettuce, spinachSow outdoors · Aug 3 – Aug 17

GarlicPlant cloves · Sep 14 – Oct 19

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 14) and first fall frost (Sep 28) 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 56738 came on Apr 30 — 4 days later than the 1991–2020 average (Apr 26).

average
Apr 262026
Apr 30

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 Minnesota

287 plants native to the lower 48 states, recorded in Minnesota, 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 Newfolden, MN.

Soil in Newfolden, MN

The soil mapped at the center of ZIP 56738 is Foxhome — sandy loam, moderately well drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding

pH7.2neutral; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter3%moderate

Hydrologic groupBwater soaks in moderately

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Foxhome sandy loam, 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 56738; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Newfolden, MN

Summer high80 °Faverage high, July

Winter low−3 °Faverage low, January

Hot days6days a year at 90 °F or more

Freezing nights182nights a year at 32 °F or less

Growing degree days2,107base 50 °F — the season’s usable heat

Longest day16 h 06 mindaylight on June 21

Shortest day8 h 19 mindaylight on December 21

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

Precipitation24.4 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: Thief Rvr Falls 2, MN (16 mi away); precipitation: Agassiz Refuge, MN (17 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

567603b

Viking, MN · 9 mi

567583b

Strandquist, MN · 13 mi

567373b

Middle River, MN · 16 mi

567014a

Thief River Falls, MN · 17 mi

567323b

Karlstad, MN · 17 mi

567593b

Strathcona, MN · 18 mi

Minnesota planting zones →

Questions about 56738

What planting zone is ZIP code 56738?

ZIP code 56738 (Newfolden, MN) 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 Newfolden, MN?

The median last spring frost (32 °F) near 56738 is May 14; after May 29 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Thief Rvr Falls 2 station.

When is the first frost in Newfolden, MN?

The median first fall frost near 56738 is September 28, giving a median frost-free growing season of 135 days.

When should I plant tomatoes in 56738?

Start tomato seeds indoors around Mar 19 – Apr 2 and set transplants outside around May 21 – Jun 4, one to three weeks after the median last frost.

How much rain and snow does 56738 get?

About 24.4 inches of precipitation a year (NOAA 1991–2020 normals, Agassiz Refuge station).

How hot do summers get in Newfolden, MN?

The average high peaks at 80 °F in July, with about 6 days a year at 90 °F or more.

What kind of soil does 56738 have?

The USDA soil survey maps Foxhome at the center of ZIP 56738: sandy loam, moderately well drained, pH about 7.2 (neutral).

Did spring come early in Newfolden, MN in 2026?

Spring leaf-out near 56738 came on Apr 30 in 2026, 4 days later than the 1991–2020 average (Apr 26), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Newfolden, MN?

Long-day onions: the longest day near 56738 is 16 h 06 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).