St. Ignace, Michigan, sits in USDA hardiness zones 4a-5b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Crops well matched to these conditions include cherry, blueberry, apple, and asparagus — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in St. Ignace, 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 St. Ignace lot. Enter your address and we'll score 1,112 plants against your land's actual soil, sun, and frost.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Quick Facts
USDA Zones
4a-5b
Last Hard Freeze (28°F)
Apr 22
Town normal — light frosts run a few weeks later
First Hard Freeze (28°F)
Nov 11
Town normal — light frosts arrive a few weeks earlier
City Area
2K acres
Hardiness Zone Range
Zone maps are averages across St. Ignace. Your yard's slope, trees, and frost pockets shift what actually grows — see your land's exact reading.
Soil varies lot by lot — soil types explained.
What Grows in St. Ignace
Plants matched to St. Ignace's USDA zones 4a-5b — each links to its full growing profile.
Is it too late to plant in St. Ignace?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 25; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 22 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 11 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
Growing Challenges in Michigan
What an experienced grower plans around here — each one has a move.
Lake effect weather creates highly localized microclimates
Lake effect rewrites the map mile by mile — check your exact site, not your region, before you commit a planting plan.
Short northern season (100-120 frost-free days in UP)
Up north, fast-maturing varieties plus a hoop house or cold frame turn a tight season into a dependable one.
Sandy soils in western MI drain too quickly
Compost and cover crops, applied annually, teach sandy ground to hold water — the west-side fix is organic matter.
For cultivar selection, pest pressure, and planting-time guidance specific to Michigan, the MSU Extension is the authoritative local source.
Environmental Intelligence
Understanding what's nearby helps you make informed decisions about where and how to grow.
Sources Checked
within ~10 miles of St. Ignace
Severity Distribution
within ~10 miles of St. Ignace
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around St. Ignace, Underground Storage Tanks runs higher than the national average — 63 sites nearby. That's not a problem with your land — it's information about it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in St. Ignace
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,112 plant recommendations.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
Your Specific Parcel Matters
St. Ignace Average
- ●USDA Zones 4a-5b
- ●Generic soil type for the area
- ●State-average frost dates
YOUR Parcel
- ✓Your exact hardiness zone
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in St. Ignace
Pull a site-specific report for your exact address in St. Ignace, Michigan — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
Key Growing Facts for St. Ignace, Michigan
- USDA Hardiness Zones: 4a-5b (USDA PHZM 2023)
- Last Hard Freeze (28°F): Apr 22 (town normal, NOAA 1991–2020 Climate Normals — light frosts can follow for a few weeks)
- First Hard Freeze (28°F): Nov 11 (town normal, NOAA 1991–2020 Climate Normals — light frosts can arrive a few weeks earlier)
- Days Between Hard Freezes: ~203 (town normal, NOAA 1991–2020 Climate Normals)
- Land Area: 2K acres (US Census TIGER 2025)
Zone data: USDA ARS Plant Hardiness Zone Map 2023. Climate data: NOAA NCEI. Boundaries: US Census TIGER/Line 2025.
Frequently Asked Questions
What hardiness zone is St. Ignace, Michigan?
St. Ignace sits in USDA hardiness zones 4a-5b, per the USDA Plant Hardiness Zone Map 2023. Zones reflect average annual extreme minimum temperatures from 1991–2020 weather data.
Is it too late to plant in St. Ignace?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 25; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 22 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 11 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
When does frost risk typically end in St. Ignace?
The last hard freeze (28°F) in St. Ignace typically lands around Apr 22, per NOAA 1991–2020 climate normals — an earlier marker than the light-frost dates many planting charts quote. That marks the hard freeze, not the last light frost — light frosts can still bite for a few more weeks, so tender transplants usually wait another 2–3 weeks.
When is the first frost in St. Ignace?
The first hard freeze (28°F) in St. Ignace typically arrives around Nov 11, per NOAA 1991–2020 climate normals — the point most tender summer crops finish. Lighter frosts usually reach a couple of weeks earlier, so watch the forecast from late summer on and harvest or cover tender plants before the first cold night.
What vegetables grow in St. Ignace?
St. Ignace's zones 4a-5b support a wide range — strong performers include Cherry, Blueberry, Apple, Asparagus, and White Pine. What actually takes on any one site comes down to its soil, sun, and drainage, and we score each plant against the real conditions at your address.
Which hardiness zone is St. Ignace, really?
Officially, St. Ignace sits in USDA zones 4a-5b (USDA PHZM 2023) — but a zone is a 30-year average of winter's coldest night across an area, and it can't see any one yard. A south-facing slope, a tree line, or a low frost pocket can shift a single site by half a zone either way, which is why neighboring gardeners often quote different numbers. We read the conditions at your exact address — soil, sun, slope, and frost — and score 1,112 plants against what's actually there.
Is the soil safe to grow vegetables in St. Ignace?
The federal record around St. Ignace shows 93 documented sites — 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 St. Ignace?
As the season closes around the first 28°F hard freeze near Nov 11 (NOAA 1991–2020 climate normals), a few moves buy time: cover tender plants with floating row cover or an old sheet on still, clear nights, water the soil the afternoon before a freeze so it holds warmth overnight, and harvest frost-tender crops like tomatoes, peppers, and basil before the first hard night. Hardy greens and root crops shrug off light frost and often sweeten after it, so leave them in.
Everything on this page is a St. Ignace average. Your yard writes its own version — we read soil, sun, drainage, and frost at your exact address. Try it for 14 days — no card required.