Garden Grove, Iowa, sits in USDA hardiness zone 5b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, cranberry, lavender, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Garden Grove, 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 Garden Grove 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 Garden Grove — soil, climate, flood, and parcel records. How we handle your address.
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Garden Grove — the short answer
Garden Grove, Iowa: USDA zone 5b, about 189 days between hard freezes, across 433 acres of city.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 14
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~189
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 433 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 Garden Grove's average, not your lot's — a low corner or a tree line moves it. Against Garden Grove's 189-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Garden Grove
Each reading below is measured for Garden Grove itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredGarden Grove runs about 189 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
MeasuredGarden Grove 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 Garden Grove is in
Garden Grove sits in the Central Irregular Plains — EPA Level III, inside the wider Great Plains. That is read at Garden Grove's own centroid rather than borrowed from Decatur County.
What Grows in Garden Grove
Every plant below cleared Garden Grove's own zone 5b and its 189-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in Garden Grove?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Mar 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 14 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 20 — long-season crops need about 90 days of runway, quick greens only 30. Even past midsummer there is room for a true fall garden here, and garlic planted near the close carries the momentum into next year.
What's on the federal record near Garden Grove
Closest first, within ~10 miles of Garden Grove. Listing isn't leaking, and distance isn't exposure.
- MORMON TRAIL COMM SCHOOLUnderground Storage Tanks · 300 ft
- TOM MOSERUnderground Storage Tanks · 300 ft
- MORMON TRAIL JR-SR HIGH SCHOOLBrownfields · 450 ft
- GARDEN GROVE STOREUnderground Storage Tanks · 1200 ft
- 070N24W34BBBA 09894 1958Garden Grove 1Nitrate · 1600 ft
- 070N24W34BADA 03346 1948Garden Grove Test 2Nitrate · 1800 ft
- GARDEN GROVE WATER SUPPLYPFAS · 2.2 mi
- 070N23W28DC 1951Nitrate · 5.4 mi
- STREET TOWN&COUNTRYUnderground Storage Tanks · 6.0 mi
- RICHARD OIL COUnderground Storage Tanks · 6.0 mi
- CASEY''S GENERAL STORE 1125Underground Storage Tanks · 6.1 mi
- STREET TOWN & CO INCUnderground Storage Tanks · 6.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Garden Grove'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 Garden Grove.
Sources Checked
within ~10 miles of Garden Grove
Severity Distribution
within ~10 miles of Garden Grove
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Garden Grove, Nitrate runs higher than the national average — 28 sites within ~10 miles of Garden Grove. 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 Garden Grove
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 Garden Grove average
Your land is one point inside Garden Grove
Everything above resolves to Garden Grove as a whole — one PHZM band and one 28°F frost record, read across 433 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 Garden Grove Average
Garden Grove Average
- ●USDA Zones 5b, averaged across Garden Grove
- ●One soil character for all of Garden Grove
- ●Frost dates read at Garden Grove's scale: Apr 14 to Oct 20
YOUR Parcel
- ✓Your exact zone, not Garden Grove's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Garden Grove
Pull a site-specific report for your exact address in Garden Grove, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Garden Grove averages can't show:
We read public map data around Garden Grove — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Garden Grove average
How we know this about Garden Grove
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 Garden Grove’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 Garden Grove
When does frost risk typically end in Garden Grove?
The last hard freeze (28°F) in Garden Grove typically lands around Apr 14, 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 5.
When is the first frost in Garden Grove?
The first hard freeze (28°F) in Garden Grove typically arrives around Oct 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 6, so the watching starts about Sep 20 — about 189 days after the spring freeze cleared.
How long is the growing season in Garden Grove?
Measured between 28°F hard freezes, Garden Grove sees about 189 frost-free days — roughly Apr 14 through Oct 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 5 to Oct 6, about 154 days.
Is the soil safe to grow vegetables in Garden Grove?
The federal record around Garden Grove shows 67 documented sites, mostly Underground Storage Tanks entries (31), the nearest Underground Storage Tanks record under a tenth of a mile 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 Garden Grove?
From about Sep 20 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Garden Grove's scale — its 5b band and its 189-day season. Your yard writes its own version of Garden Grove'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 Garden Grove’s own scale
6 of the readings below were taken at Garden Grove's own scale — its own ~189-day season between 28°F freezes, the 433 acres it covers and 67 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Garden Grove's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Garden Grove's own 28°F hard-freeze dates, about Apr 14 and Oct 20 and the ~189-day span between themNOAA 1991–2020 Climate Normals
- 67 documented contamination sites on the federal record near Garden Grove, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Garden Grove's boundary and the 433 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~189-day seasonGrowable Ground crop-matching engine
- The ecoregion at Garden Grove's own centroid, the Central Irregular PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Garden Grove's 433 acres read through its county's SSURGO summaryfrom Decatur County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Decatur 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 Decatur County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Garden Grove's 433 acreswhy one lot differs from the next →
- Which side of Garden Grove you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 433 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 Garden Grove-wide figureread your own land →
More in Iowa
Wider growing context
What grows across IowaGarden Grove sits outside our named growing regions, so Iowa as a whole is its closest context here.