Laredo, Montana, sits in USDA hardiness zone 4a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Growers here do well with cabbage, cranberry, turkish rocket, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Laredo, 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 Laredo 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 Laredo — soil, climate, flood, and parcel records. How we handle your address.
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Laredo — the short answer
Laredo, Montana: USDA zone 4a, about 154 days between hard freezes, across 120 acres of town.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 2
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~154
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 120 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 4a is Laredo's average, not your lot's — a low corner or a tree line moves it. Against Laredo's 154-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Laredo
Each reading below is measured for Laredo itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredLaredo runs about 154 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
MeasuredLaredo sits in USDA hardiness zone 4a.
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 Laredo is in
Laredo sits in the Northwestern Glaciated Plains — EPA Level III, inside the wider Great Plains. That is read at Laredo's own centroid rather than borrowed from Hill County.
What Grows in Laredo
Every plant below cleared Laredo's own zone 4a and its 154-day season. Each card opens that plant's Montana profile. How we score.
Is it too late to plant in Laredo?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Apr 3; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 2 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
What's on the federal record near Laredo
Closest first, within ~10 miles of Laredo. Listing isn't leaking, and distance isn't exposure.
- 31N14E03CDDC01Nitrate · 2.6 mi
- 31N15E34CCCB01Nitrate · 5.5 mi
- NORTHERN AGRICULTURAL RESEARCHBrownfields · 6.1 mi
- NORTHERN AGRICULTURAL RESEARCHCAFO · 6.1 mi
- FRIEDES HWY MARKETUnderground Storage Tanks · 6.2 mi
- 32N14E30CBBA01Nitrate · 6.4 mi
- OCEAN ENERGY, INC. - HILL COUNTY #1Brownfields · 8.0 mi
- 31N13E32BAAA01Nitrate · 8.3 mi
- 32N14E04CCBC01Nitrate · 8.9 mi
- BURNHAM FARMS INCUnderground Storage Tanks · 8.9 mi
- US BORDER PATROLUnderground Storage Tanks · 9.1 mi
- HAVRE BORDER PATROL STATION HGUnderground Storage Tanks · 9.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Laredo'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 Laredo.
Total Sites
26
within ~10 miles of Laredo
Risk Level
Low
Highest-severity
1 concentrated animal feeding operation
Sources Checked
within ~10 miles of Laredo
Severity Distribution
within ~10 miles of Laredo
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Laredo, Nitrate runs higher than the national average — 10 sites within ~10 miles of Laredo. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Laredo
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 Laredo average
Your land is one point inside Laredo
Everything above resolves to Laredo as a whole — one PHZM band and one 28°F frost record, read across 120 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 town 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 Laredo Average
Laredo Average
- ●USDA Zones 4a, averaged across Laredo
- ●One soil character for all of Laredo
- ●Frost dates read at Laredo's scale: May 1 to Oct 2
YOUR Parcel
- ✓Your exact zone, not Laredo's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Laredo
Pull a site-specific report for your exact address in Laredo, Montana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Laredo averages can't show:
We read public map data around Laredo — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Laredo average
How we know this about Laredo
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Laredo’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 town grain anywhere on this page — there is no town-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 Laredo
When does frost risk typically end in Laredo?
The last hard freeze (28°F) in Laredo typically lands around May 1, 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 22.
When is the first frost in Laredo?
The first hard freeze (28°F) in Laredo typically arrives around Oct 2, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 18, so the watching starts about Sep 2 — about 154 days after the spring freeze cleared.
How long is the growing season in Laredo?
Measured between 28°F hard freezes, Laredo sees about 154 frost-free days — roughly May 1 through Oct 2, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 22 to Sep 18, about 119 days.
Is the soil safe to grow vegetables in Laredo?
The federal record around Laredo is light — 26 documented sites across the 9 federal source types we checked, mostly Nitrate entries (10), the nearest Nitrate record about 2.6 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Laredo?
From about Sep 2 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 2 (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 2. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Laredo's scale — its 4a band and its 154-day season. Your yard writes its own version of Laredo'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 Laredo’s own scale
6 of the readings below were taken at Laredo's own scale — its own ~154-day season between 28°F freezes, the 120 acres it covers and 26 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Laredo's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Laredo's own 28°F hard-freeze dates, about May 1 and Oct 2 and the ~154-day span between themNOAA 1991–2020 Climate Normals
- 26 documented contamination sites on the federal record near Laredo, the closest Nitrate record about 2.6 miles out from the town centreFederal environmental registers
- Laredo's boundary and the 120 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~154-day seasonGrowable Ground crop-matching engine
- The ecoregion at Laredo's own centroid, the Northwestern Glaciated PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Laredo's 120 acres read through its county's SSURGO summaryfrom Hill County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Hill County
- The growing challenges every Montana grower plans around — written at state scale, so they stay on the state guidefrom Montana
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Hill County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Laredo's 120 acreswhy one lot differs from the next →
- Which side of Laredo you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 120 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 2.6 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 Laredo-wide figureread your own land →
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