Dolliver, Iowa, 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.
Growers here do well with cabbage, cranberry, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Dolliver, 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 Dolliver 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 Dolliver — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Dolliver — the short answer
Dolliver, Iowa: USDA zone 5a, about 183 days between hard freezes, across 218 acres of city.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~183
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 218 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 Dolliver's average, not your lot's — a low corner or a tree line moves it. Against Dolliver's 183-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Dolliver
Each reading below is measured for Dolliver itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDolliver 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
MeasuredDolliver 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 Dolliver is in
Dolliver sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Dolliver's own centroid rather than borrowed from Emmet County.
What Grows in Dolliver
Every plant below cleared Dolliver's own zone 5a and its 183-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in Dolliver?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 17 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
What's on the federal record near Dolliver
Closest first, within ~10 miles of Dolliver. Listing isn't leaking, and distance isn't exposure.
- M & M FARM CENTERUnderground Storage Tanks · 600 ft
- 100N32W22CAB 01086 1939Dolliver 2Nitrate · 750 ft
- 100N32W11DDDD 00264 1933Okemanpedan State ParkNitrate · 2.5 mi
- 100N31W29ABA 04284 1950Nitrate · 4.3 mi
- ODEGAARD MARINE SERVICE CENTERBrownfields · 4.9 mi
- MYERS REFINISHINGBrownfields · 4.9 mi
- 101N32W24CAC 01 0000178463Nitrate · 4.9 mi
- HAWKEYE TWOCAFO · 4.9 mi
- CLAIR SCHMIDT JR FARMCAFO · 5.1 mi
- KEVIN SCHMIDT FARM 1CAFO · 5.1 mi
- Nuway Coop AssnUnderground Storage Tanks · 5.6 mi
- ANDY GERHARDT SITE #3 - CEYLON EASTCAFO · 5.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Dolliver'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 Dolliver.
Total Sites
50
within ~10 miles of Dolliver
Risk Level
Moderate
Highest-severity
2 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Dolliver
Severity Distribution
within ~10 miles of Dolliver
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Dolliver, two things run higher than the national average within ~10 miles of Dolliver — CAFO (8 sites) and Nitrate (18 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Dolliver
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 Dolliver average
Your land is one point inside Dolliver
Everything above resolves to Dolliver as a whole — one PHZM band and one 28°F frost record, read across 218 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 Dolliver Average
Dolliver Average
- ●USDA Zones 5a, averaged across Dolliver
- ●One soil character for all of Dolliver
- ●Frost dates read at Dolliver's scale: Apr 17 to Oct 17
YOUR Parcel
- ✓Your exact zone, not Dolliver's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Dolliver
Pull a site-specific report for your exact address in Dolliver, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Dolliver averages can't show:
We read public map data around Dolliver — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Dolliver average
How we know this about Dolliver
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 Dolliver’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 Dolliver
When does frost risk typically end in Dolliver?
The last hard freeze (28°F) in Dolliver typically lands around Apr 17, 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 8.
When is the first frost in Dolliver?
The first hard freeze (28°F) in Dolliver typically arrives around Oct 17, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 3, so the watching starts about Sep 17 — about 183 days after the spring freeze cleared.
How long is the growing season in Dolliver?
Measured between 28°F hard freezes, Dolliver sees about 183 frost-free days — roughly Apr 17 through Oct 17, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 8 to Oct 3, about 148 days.
Is the soil safe to grow vegetables in Dolliver?
The federal record around Dolliver shows 50 documented sites, mostly Nitrate entries (18), the nearest Underground Storage Tanks 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 I protect my plants from frost in Dolliver?
From about Sep 17 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 17 (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 17. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Dolliver's scale — its 5a band and its 183-day season. Your yard writes its own version of Dolliver'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 Dolliver’s own scale
6 of the readings below were taken at Dolliver's own scale — its own ~183-day season between 28°F freezes, the 218 acres it covers and 50 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Dolliver's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Dolliver's own 28°F hard-freeze dates, about Apr 17 and Oct 17 and the ~183-day span between themNOAA 1991–2020 Climate Normals
- 50 documented contamination sites on the federal record near Dolliver, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Dolliver's boundary and the 218 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 Dolliver'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 Dolliver's 218 acres read through its county's SSURGO summaryfrom Emmet County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Emmet 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 Emmet County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Dolliver's 218 acreswhy one lot differs from the next →
- Which side of Dolliver you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 218 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Dolliver-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaDolliver sits outside our named growing regions, so Iowa as a whole is its closest context here.
Nearby growing guides