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

Planting zone for 55752 — Jacobson, MN

ZIP code 55752 (Jacobson, Aitkin County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is May 7 and the first fall frost October 3.

Where ZIP 55752 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 7
First frostOct 3
2012 zone3b

Was 3b on the 2012 map — half a zone warmer now. 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 Jacobson, 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 Jacobson, MN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 7median — 50% chance of a later frost
Safe for tender plantsMay 21only 10% chance of frost after
First fall frostOctober 3median — 10% chance by Sep 20
Growing season148 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 29 and returns around October 13.

From the NOAA station Sandy Lake Dam Libby, MN — 11 miles away, elevation 1,234 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 55752

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 26 – Apr 9
SpinachSow outdoors · Mar 26 – Apr 16
Broccoli, cabbageStart indoors · Feb 26 – Mar 12
Broccoli, cabbageTransplant · Apr 16 – Apr 30
Onion setsPlant outdoors · Apr 9 – Apr 23
PotatoesPlant outdoors · Apr 16 – Apr 30
LettuceSow outdoors · Apr 9 – Apr 23
Carrots, beetsSow outdoors · Apr 16 – Apr 30
TomatoesStart indoors · Mar 12 – Mar 26
TomatoesTransplant · May 14 – May 28
Peppers, eggplantStart indoors · Feb 26 – Mar 12
Peppers, eggplantTransplant · May 21 – Jun 4
BeansSow outdoors · May 14 – May 28
Sweet cornSow outdoors · May 14 – May 28
Cucumbers, squashSow outdoors · May 14 – May 28
Fall lettuce, spinachSow outdoors · Aug 8 – Aug 22
GarlicPlant cloves · Sep 19 – Oct 24
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 7) and first fall frost (Oct 3) 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 55752 came on Apr 22 — 3 days earlier than the 1991–2020 average (Apr 25).

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 Minnesota

445 plants native to the lower 48 states, recorded in Minnesota, and rated by the USDA to survive −30 °F or colder — the bottom of zone 4a. Each links to its USDA PLANTS profile.

Trees 45

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °Fbalsam fir60 ft · blooms mid summer · low shade tolerance · to −43 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °F

Shrubs 77

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °F

Wildflowers & perennials 173

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °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 lotus3 ft · blooms mid summer · high shade tolerance · to −36 °F

Grasses 140

alkali cordgrass3 ft · blooms late summer · high 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 °Fbasin wildrye5 ft · blooms early spring · high shade tolerance · to −43 °Fbeaked sedge4 ft · blooms late spring · low shade tolerance · to −38 °FBebb's sedge3 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 3

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 °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 Jacobson, MN.

Soil in Jacobson, MN

The soil mapped at the center of ZIP 55752 is Itasca — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH5.8moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.75%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classprime farmlandUSDA classification

Map unit: Itasca silt loam, 1 to 6 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 55752; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Jacobson, MN

Summer high78 °Faverage high, July
Winter low−2 °Faverage low, January
Hot days4days a year at 90 °F or more
Freezing nights182nights a year at 32 °F or less
Growing degree days1,998base 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)
Precipitation31.1 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 19 °F, low -2 °F 19°−2° JanFebruary: average high 25 °F, low 0 °F 25°0° FebMarch: average high 37 °F, low 14 °F 37°14° MarApril: average high 51 °F, low 30 °F 51°30° AprMay: average high 65 °F, low 43 °F 65°43° MayJune: average high 74 °F, low 53 °F 74°53° JunJuly: average high 78 °F, low 58 °F 78°58° JulAugust: average high 77 °F, low 56 °F 77°56° AugSeptember: average high 69 °F, low 48 °F 69°48° SepOctober: average high 54 °F, low 35 °F 54°35° OctNovember: average high 37 °F, low 22 °F 37°22° NovDecember: average high 24 °F, low 7 °F 24°7° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 0.84 in precipitation 0.8 JanFebruary: 0.93 in precipitation 0.9 FebMarch: 1.41 in precipitation 1.4 MarApril: 2.44 in precipitation 2.4 AprMay: 3.39 in precipitation 3.4 MayJune: 4.60 in precipitation 4.6 JunJuly: 4.61 in precipitation 4.6 JulAugust: 3.80 in precipitation 3.8 AugSeptember: 3.38 in precipitation 3.4 SepOctober: 2.89 in precipitation 2.9 OctNovember: 1.48 in precipitation 1.5 NovDecember: 1.31 in precipitation 1.3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Sandy Lake Dam Libby, MN (11 mi away); precipitation: Mcgregor 7.3 N, MN (17 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 4a.

557844a
Swan River, MN · 8 mi
557934a
Warba, MN · 11 mi
557424a
Goodland, MN · 16 mi
557484a
Hill City, MN · 16 mi
557874a
Tamarack, MN · 17 mi
564694a
Palisade, MN · 19 mi
557604a
Mcgregor, MN · 21 mi
557854a
Swatara, MN · 23 mi

Minnesota planting zones →

Questions about 55752

What planting zone is ZIP code 55752?

ZIP code 55752 (Jacobson, MN) 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 Jacobson, MN?

The median last spring frost (32 °F) near 55752 is May 7; after May 21 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Sandy Lake Dam Libby station.

When is the first frost in Jacobson, MN?

The median first fall frost near 55752 is October 3, giving a median frost-free growing season of 148 days.

When should I plant tomatoes in 55752?

Start tomato seeds indoors around Mar 12 – Mar 26 and set transplants outside around May 14 – May 28, one to three weeks after the median last frost.

How much rain and snow does 55752 get?

About 31.1 inches of precipitation a year (NOAA 1991–2020 normals, Mcgregor 7.3 N station).

How hot do summers get in Jacobson, MN?

The average high peaks at 78 °F in July, with about 4 days a year at 90 °F or more.

What kind of soil does 55752 have?

The USDA soil survey maps Itasca at the center of ZIP 55752: silt loam, well drained, pH about 5.8 (moderately acidic).

Did spring come early in Jacobson, MN in 2026?

Spring leaf-out near 55752 came on Apr 22 in 2026, 3 days earlier than the 1991–2020 average (Apr 25), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Jacobson, MN?

Long-day onions: the longest day near 55752 is 15 h 53 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 55752 change?

Yes. The 2012 USDA map put 55752 in zone 3b; the 2023 map puts it in zone 4a. The newer map uses 1991–2020 data and more weather stations.