Alamo, North Dakota, sits in USDA hardiness zone 4a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, cranberry, cilantro, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Alamo, 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 Alamo 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 Alamo — soil, climate, flood, and parcel records. How we handle your address.
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Alamo — the short answer
Alamo, North Dakota: USDA zone 4a, about 146 days between hard freezes, across 351 acres of city.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Sep 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~146
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 351 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 Alamo's average, not your lot's — a low corner or a tree line moves it. Against Alamo's 146-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Alamo
Each reading below is measured for Alamo itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredAlamo runs about 146 days between hard freezes — a short growing season.
Long-maturing crops like melons, sweet potatoes, and winter squash can run out of runway before the first hard freeze, ripening late or not at all.
Lead with fast-maturing varieties, and stretch the season on both ends with cold frames, low tunnels, or a greenhouse.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredAlamo 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 Alamo is in
Alamo sits in the Northwestern Glaciated Plains — EPA Level III, inside the wider Great Plains. That is read at Alamo's own centroid rather than borrowed from Williams County.
What Grows in Alamo
Every plant below cleared Alamo's own zone 4a and its 146-day season. Each card opens that plant's North Dakota profile. How we score.
Is it too late to plant in Alamo?
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 9; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 7 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 30 — long-season crops need about 90 days of runway, quick greens only 30. Even here the calendar’s edges hold value: thirty-day greens late in the window, then garlic and a rested bed for spring.
What's on the federal record near Alamo
Closest first, within ~10 miles of Alamo. Listing isn't leaking, and distance isn't exposure.
- 159-099-22CBBNitrate · 750 ft
- Push N PullUnderground Storage Tanks · 800 ft
- 159-099-21DABNitrate · 2100 ft
- 158-099-15AAA2Nitrate · 4.5 mi
- 158-099-15AAA1Nitrate · 4.5 mi
- 158-099-07DDDNitrate · 4.9 mi
- 158-099-12DCCNitrate · 4.9 mi
- 158-099-16CDDNitrate · 5.4 mi
- 159-100-27ACBNitrate · 5.7 mi
- 158-098-07DDDNitrate · 5.7 mi
- 160-099-25ACACNitrate · 5.7 mi
- 160-099-25ACANitrate · 5.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Alamo'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 Alamo.
Severity Distribution
within ~10 miles of Alamo
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Alamo, Nitrate runs higher than the national average — 60 sites within ~10 miles of Alamo. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
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 Alamo
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 Alamo average
Your land is one point inside Alamo
Everything above resolves to Alamo as a whole — one PHZM band and one 28°F frost record, read across 351 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 Alamo Average
Alamo Average
- ●USDA Zones 4a, averaged across Alamo
- ●One soil character for all of Alamo
- ●Frost dates read at Alamo's scale: May 7 to Sep 30
YOUR Parcel
- ✓Your exact zone, not Alamo's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Alamo
Pull a site-specific report for your exact address in Alamo, North Dakota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Alamo averages can't show:
We read public map data around Alamo — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Alamo average
How we know this about Alamo
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 Alamo’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 Alamo
When does frost risk typically end in Alamo?
The last hard freeze (28°F) in Alamo typically lands around May 7, 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 28.
When is the first frost in Alamo?
The first hard freeze (28°F) in Alamo typically arrives around Sep 30, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 16, so the watching starts about Aug 31 — about 146 days after the spring freeze cleared.
How long is the growing season in Alamo?
Measured between 28°F hard freezes, Alamo sees about 146 frost-free days — roughly May 7 through Sep 30, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 28 to Sep 16, about 111 days.
Is the soil safe to grow vegetables in Alamo?
The federal record around Alamo shows 62 documented sites, mostly Nitrate entries (60), the nearest Nitrate record about 0.1 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do gardeners stretch the season in Alamo?
With about 146 frost-free days between hard freezes, Alamo rewards the classic extension moves: floating row cover buys roughly two to four extra weeks at each shoulder — on this season that is a working window nearer 174 to 202 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 7 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Alamo's scale — its 4a band and its 146-day season. Your yard writes its own version of Alamo'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 Alamo’s own scale
6 of the readings below were taken at Alamo's own scale — its own ~146-day season between 28°F freezes, the 351 acres it covers and 62 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Alamo's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Alamo's own 28°F hard-freeze dates, about May 7 and Sep 30 and the ~146-day span between themNOAA 1991–2020 Climate Normals
- 62 documented contamination sites on the federal record near Alamo, the closest Nitrate record about 0.1 miles out from the town centreFederal environmental registers
- Alamo's boundary and the 351 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~146-day seasonGrowable Ground crop-matching engine
- The ecoregion at Alamo's own centroid, the Northwestern Glaciated PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Alamo's 351 acres read through its county's SSURGO summaryfrom Williams County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Williams County
- The growing challenges every North Dakota grower plans around — written at state scale, so they stay on the state guidefrom North Dakota
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Williams County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Alamo's 351 acreswhy one lot differs from the next →
- Which side of Alamo you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 351 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.1 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 Alamo-wide figureread your own land →
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