Spiritwood, North Dakota, 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.
A short list that earns its place here — cabbage, cranberry, turkish rocket, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Spiritwood, 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 Spiritwood 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 Spiritwood — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Spiritwood — the short answer
Spiritwood, North Dakota: USDA zone 4a, about 163 days between hard freezes, across 561 acres of town.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~163
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 561 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 Spiritwood's average, not your lot's — a low corner or a tree line moves it. Against Spiritwood's 163-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Spiritwood
Each reading below is measured for Spiritwood itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSpiritwood runs about 163 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
MeasuredSpiritwood 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 Spiritwood is in
Spiritwood sits in the Northern Glaciated Plains — EPA Level III, inside the wider Great Plains. That is read at Spiritwood's own centroid rather than borrowed from Stutsman County.
What Grows in Spiritwood
Every plant below cleared Spiritwood's own zone 4a and its 163-day season. Each card opens that plant's North Dakota profile. How we score.
Is it too late to plant in Spiritwood?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Apr 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 30 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 10 — 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 Spiritwood
Closest first, within ~10 miles of Spiritwood. Listing isn't leaking, and distance isn't exposure.
- GREEN BISON SOY PROCESSING, LLCToxics Release Inventory · 2200 ft
- 140-062-22AAA2Nitrate · 2400 ft
- Cargill IncUnderground Storage Tanks · 0.5 mi
- 140-062-16DDD1Nitrate · 0.6 mi
- GREEN BISON SOY PROCESSING, LLCBrownfields · 0.7 mi
- SPIRITWOOD STATIONToxics Release Inventory · 0.7 mi
- SPIRITWOOD STATIONBrownfields · 0.7 mi
- DAKOTA SPIRIT AGENERGYToxics Release Inventory · 1.0 mi
- DAKOTA SPIRIT AGENERGYBrownfields · 1.0 mi
- 140-062-23ABBNitrate · 1.1 mi
- 140-062-09DDD2Nitrate · 1.3 mi
- 140-062-23AABNitrate · 1.3 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Spiritwood'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 Spiritwood.
Total Sites
161
within ~10 miles of Spiritwood
Risk Level
Moderate
Highest-severity
6 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Spiritwood
Severity Distribution
within ~10 miles of Spiritwood
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Spiritwood, Nitrate runs higher than the national average — 102 sites within ~10 miles of Spiritwood. 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 Spiritwood
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 Spiritwood average
Your land is one point inside Spiritwood
Everything above resolves to Spiritwood as a whole — one PHZM band and one 28°F frost record, read across 561 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 Spiritwood Average
Spiritwood Average
- ●USDA Zones 4a, averaged across Spiritwood
- ●One soil character for all of Spiritwood
- ●Frost dates read at Spiritwood's scale: Apr 30 to Oct 10
YOUR Parcel
- ✓Your exact zone, not Spiritwood's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Spiritwood
Pull a site-specific report for your exact address in Spiritwood, North Dakota — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Spiritwood averages can't show:
We read public map data around Spiritwood — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Spiritwood average
How we know this about Spiritwood
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 Spiritwood’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 Spiritwood
When does frost risk typically end in Spiritwood?
The last hard freeze (28°F) in Spiritwood typically lands around Apr 30, 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 21.
When is the first frost in Spiritwood?
The first hard freeze (28°F) in Spiritwood typically arrives around Oct 10, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 26, so the watching starts about Sep 10 — about 163 days after the spring freeze cleared.
How long is the growing season in Spiritwood?
Measured between 28°F hard freezes, Spiritwood sees about 163 frost-free days — roughly Apr 30 through Oct 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 21 to Sep 26, about 128 days.
Is the soil safe to grow vegetables in Spiritwood?
The federal record around Spiritwood shows 161 documented sites, mostly Nitrate entries (102), the nearest Toxics Release Inventory record about 0.4 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 I protect my plants from frost in Spiritwood?
From about Sep 10 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 10 (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 10. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Spiritwood's scale — its 4a band and its 163-day season. Your yard writes its own version of Spiritwood'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 Spiritwood’s own scale
6 of the readings below were taken at Spiritwood's own scale — its own ~163-day season between 28°F freezes, the 561 acres it covers and 161 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Spiritwood's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Spiritwood's own 28°F hard-freeze dates, about Apr 30 and Oct 10 and the ~163-day span between themNOAA 1991–2020 Climate Normals
- 161 documented contamination sites on the federal record near Spiritwood, the closest Toxics Release Inventory record about 0.4 miles out from the town centreFederal environmental registers
- Spiritwood's boundary and the 561 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~163-day seasonGrowable Ground crop-matching engine
- The ecoregion at Spiritwood's own centroid, the Northern Glaciated PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Spiritwood's 561 acres read through its county's SSURGO summaryfrom Stutsman County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Stutsman 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 Stutsman County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Spiritwood's 561 acreswhy one lot differs from the next →
- Which side of Spiritwood you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 561 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Toxics Release Inventory record about 0.4 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 Spiritwood-wide figureread your own land →
More in North Dakota
Wider growing context
What grows across North DakotaSpiritwood sits outside our named growing regions, so North Dakota as a whole is its closest context here.
Nearby growing guides