College Springs, Iowa, sits in USDA hardiness zone 5b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
On paper, cabbage, cranberry, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in College Springs, 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 College Springs 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 College Springs — soil, climate, flood, and parcel records. How we handle your address.
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College Springs — the short answer
College Springs, Iowa: USDA zone 5b, about 201 days between hard freezes, across 717 acres of city.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 8
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~201
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 717 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 5b is College Springs's average, not your lot's — a low corner or a tree line moves it. Against College Springs's 201-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in College Springs
Each reading below is measured for College Springs itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCollege Springs runs about 201 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredCollege Springs sits in USDA hardiness zone 5b.
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 College Springs is in
College Springs sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at College Springs's own centroid rather than borrowed from Page County.
What Grows in College Springs
Every plant below cleared College Springs's own zone 5b and its 201-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in College Springs?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 11; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 8 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 26 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
What's on the federal record near College Springs
Closest first, within ~10 miles of College Springs. Listing isn't leaking, and distance isn't exposure.
- COLLEGE SPRINGS OIL COUnderground Storage Tanks · 350 ft
- SOUTH PAGE COMMUNITY SCHOOLUnderground Storage Tanks · 550 ft
- SOUTH PAGE COMMUNITY SCHOOLBrownfields · 600 ft
- 067N37W22DCD 1946Nitrate · 3.0 mi
- HULL TRAILERS INCBrownfields · 5.0 mi
- Not KnownUnderground Storage Tanks · 5.6 mi
- AT&T COMMUNICATIONSUnderground Storage Tanks · 5.6 mi
- CITY HALLUnderground Storage Tanks · 5.6 mi
- 067N38W05BAAC 00113 1935Coin 1Nitrate · 5.7 mi
- CLARINDA WATER PLANTPFAS · 5.8 mi
- GIVENS SHOPUnderground Storage Tanks · 6.0 mi
- 067N38W05BAAC 38170 1955Coin NorthNitrate · 6.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from College Springs'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 College Springs.
Total Sites
67
within ~10 miles of College Springs
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of College Springs
Severity Distribution
within ~10 miles of College Springs
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around College Springs, Toxics Release Inventory runs higher than the national average — 5 sites within ~10 miles of College Springs. That's not a problem with your land — it's information about it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in College Springs
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 College Springs average
Your land is one point inside College Springs
Everything above resolves to College Springs as a whole — one PHZM band and one 28°F frost record, read across 717 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 College Springs Average
College Springs Average
- ●USDA Zones 5b, averaged across College Springs
- ●One soil character for all of College Springs
- ●Frost dates read at College Springs's scale: Apr 8 to Oct 26
YOUR Parcel
- ✓Your exact zone, not College Springs's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in College Springs
Pull a site-specific report for your exact address in College Springs, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that College Springs averages can't show:
We read public map data around College Springs — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the College Springs average
How we know this about College Springs
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 College Springs’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 College Springs
When does frost risk typically end in College Springs?
The last hard freeze (28°F) in College Springs typically lands around Apr 8, 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 Apr 29.
When is the first frost in College Springs?
The first hard freeze (28°F) in College Springs typically arrives around Oct 26, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 12, so the watching starts about Sep 26 — about 201 days after the spring freeze cleared.
How long is the growing season in College Springs?
Measured between 28°F hard freezes, College Springs sees about 201 frost-free days — roughly Apr 8 through Oct 26, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 29 to Oct 12, about 166 days.
Is the soil safe to grow vegetables in College Springs?
The federal record around College Springs is a meaningful one — 67 documented sites, mostly Underground Storage Tanks entries (35), the nearest Underground Storage Tanks record under a tenth of a mile 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 College Springs?
From about Sep 26 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 26 (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 26. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at College Springs's scale — its 5b band and its 201-day season. Your yard writes its own version of College Springs'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 College Springs’s own scale
6 of the readings below were taken at College Springs's own scale — its own ~201-day season between 28°F freezes, the 717 acres it covers and 67 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- College Springs's own USDA hardiness band, zones 5bUSDA PHZM 2023
- College Springs's own 28°F hard-freeze dates, about Apr 8 and Oct 26 and the ~201-day span between themNOAA 1991–2020 Climate Normals
- 67 documented contamination sites on the federal record near College Springs, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- College Springs's boundary and the 717 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~201-day seasonGrowable Ground crop-matching engine
- The ecoregion at College Springs'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 College Springs's 717 acres read through its county's SSURGO summaryfrom Page County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Page County
- The growing challenges every Iowa grower plans around — written at state scale, so they stay on the state guidefrom Iowa
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Page County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among College Springs's 717 acreswhy one lot differs from the next →
- Which side of College Springs you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 717 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 College Springs-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaCollege Springs sits outside our named growing regions, so Iowa as a whole is its closest context here.
Nearby growing guides