New Ulm, Minnesota, sits in USDA hardiness zone 5a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Well-matched crops include cabbage, cranberry, lavender, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in New Ulm, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single New Ulm lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around New Ulm — soil, climate, flood, and parcel records. How we handle your address.
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New Ulm — the short answer
New Ulm, Minnesota: USDA zone 5a, about 183 days between hard freezes, across 7K acres of city.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 18
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 18
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~183
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 7K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 5a is New Ulm's average, not your lot's — a low corner or a tree line moves it. Against New Ulm's 183-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in New Ulm
Each reading below is measured for New Ulm itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredNew Ulm runs about 183 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredNew Ulm sits in USDA hardiness zone 5a.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country New Ulm is in
New Ulm sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at New Ulm's own centroid rather than borrowed from Brown County.
What Grows in New Ulm
Every plant below cleared New Ulm's own zone 5a and its 183-day season. Each card opens that plant's Minnesota profile. How we score.
Is it too late to plant in New Ulm?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 21; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 18 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 18 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
What's on the federal record near New Ulm
Closest first, within ~10 miles of New Ulm. Listing isn't leaking, and distance isn't exposure.
- ZWACH WELDING SERVICEBrownfields · 1100 ft
- NEW ULM POLICE DEPARTMENTBrownfields · 1600 ft
- NEW ULM MEDICAL CENTERBrownfields · 1800 ft
- New UlmPFAS · 1900 ft
- NEW ULM NATIONAL GUARD ARMORYBrownfields · 1900 ft
- NEW ULM DENTAL CLINIC LTDBrownfields · 1900 ft
- Dennis LangeUnderground Storage Tanks · 2000 ft
- BROWN COUNTY COURTHOUSEBrownfields · 2000 ft
- Jiffy MartUnderground Storage Tanks · 2000 ft
- Wilfahrt BrothersUnderground Storage Tanks · 2100 ft
- PEDIATRIC & ADOLESCENT DENTISTRY NEW ULMBrownfields · 2100 ft
- CATHEDRAL OF THE HOLY TRINITYBrownfields · 2300 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from New Ulm's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near New Ulm.
Total Sites
277
within ~10 miles of New Ulm
Risk Level
Elevated
Highest-severity
8 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of New Ulm
Severity Distribution
within ~10 miles of New Ulm
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around New Ulm, CAFO runs higher than the national average — 16 sites within ~10 miles of New Ulm. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check your specific parcel in New Ulm
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the New Ulm average
Your land is one point inside New Ulm
Everything above resolves to New Ulm as a whole — one PHZM band and one 28°F frost record, read across 7K acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at city scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the New Ulm Average
New Ulm Average
- ●USDA Zones 5a, averaged across New Ulm
- ●One soil character for all of New Ulm
- ●Frost dates read at New Ulm's scale: Apr 18 to Oct 18
YOUR Parcel
- ✓Your exact zone, not New Ulm's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in New Ulm
Pull a site-specific report for your exact address in New Ulm, Minnesota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that New Ulm averages can't show:
We read public map data around New Ulm — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the New Ulm average
How we know this about New Ulm
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at New Ulm’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at city grain anywhere on this page — there is no city-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about New Ulm
When does frost risk typically end in New Ulm?
The last hard freeze (28°F) in New Ulm typically lands around Apr 18, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about May 9.
When is the first frost in New Ulm?
The first hard freeze (28°F) in New Ulm typically arrives around Oct 18, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 4, so the watching starts about Sep 18 — about 183 days after the spring freeze cleared.
How long is the growing season in New Ulm?
Measured between 28°F hard freezes, New Ulm sees about 183 frost-free days — roughly Apr 18 through Oct 18, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 9 to Oct 4, about 148 days.
Is the soil safe to grow vegetables in New Ulm?
The federal record around New Ulm is a meaningful one — 277 documented sites, mostly Brownfields entries (106), the nearest Brownfields record about 0.2 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in New Ulm?
From about Sep 18 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Oct 18 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Oct 18. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at New Ulm's scale — its 5a band and its 183-day season. Your yard writes its own version of New Ulm's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at New Ulm’s own scale
6 of the readings below were taken at New Ulm's own scale — its own ~183-day season between 28°F freezes, the 6,506 acres it covers and 277 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- New Ulm's own USDA hardiness band, zones 5aUSDA PHZM 2023
- New Ulm's own 28°F hard-freeze dates, about Apr 18 and Oct 18 and the ~183-day span between themNOAA 1991–2020 Climate Normals
- 277 documented contamination sites on the federal record near New Ulm, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- New Ulm's boundary and the 6,506 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~183-day seasonGrowable Ground crop-matching engine
- The ecoregion at New Ulm's own centroid, the Western Corn Belt PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so New Ulm's 6,506 acres read through its county's SSURGO summaryfrom Brown County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Brown County
- The growing challenges every Minnesota grower plans around — written at state scale, so they stay on the state guidefrom Minnesota
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Brown County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among New Ulm's 6,506 acreswhy one lot differs from the next →
- Which side of New Ulm you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 6,506 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.2 miles out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any New Ulm-wide figureread your own land →
More in Minnesota
Wider growing context
What grows across MinnesotaNew Ulm sits outside our named growing regions, so Minnesota as a whole is its closest context here.