Conditional — Some Areas
wild bergamot (zones 4-10) has limited zone overlap with Illinois (5a-7a). Only zones 5-7 in the state are suitable.
Your yard isn't the whole zone.
Illinois spans zones 5a-7a, but your yard sits in exactly one — and slope, tree cover, and cold-air pockets nudge it further. Enter your address and we'll score wild bergamot against your parcel's actual hardiness, soil, and sun.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Zone Comparison
Wild Bergamot Needs
- USDA Zones: 4-10
- Soil pH: 6.5 - 8.5
- Sun: Part Sun
- Frost-Free Days: 110+
Illinois Has
- USDA Zones: 5a-7a
- Last Frost: Apr 5 - May 10
- First Frost: Sep 30 - Oct 30
- Annual Rainfall: 34-48 inches
- Common Soils: Prairie loam, Silt loam, Clay loam
Plant Zone Range (zones 4-10)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Wild Bergamot in Illinois
The frost window
Across Illinois, the last spring frost clears between Apr 5 and May 10, and the first fall frost lands between Sep 30 and Oct 30 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 143-day window you can count on — up to 208 days on a mild site in a kind year.
Frost hardiness
Wild Bergamot is cold-hardy to -38°F (USDA PLANTS Database), so you can plant on the early side of Illinois's window — even a few weeks before the final frost date.
Establishment timing
As a long-lived plant, wild bergamot isn't racing the calendar to a harvest date. Plant it in spring once the last-frost window passes so roots settle in through the full season, or in early fall while the soil still holds summer warmth.
Timing tuned to sub-state frost dates — McHenry County, not the statewide average.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Wild Bergamot wants 110+ frost-free days; a typical Illinois site sees ~190 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Wild Bergamot needs ~1000 GDD (base 50°F) to ripen. The state median runs ~3200 GDD (USDA NRCS county aggregates), so Illinois's typical season clears that easily.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Wild Bergamot likes near-neutral soil (pH 6.5-8.5). That's the common-ground band across Illinois's prairie loam and silt loam — a soil test confirms it for your site.
Your land, not the state average
Illinois's soils run mostly silt loam, but SSURGO maps the series, texture, and drainage under your exact parcel — that map unit, not the state average, decides how wild bergamot performs.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH and drainage requirements from USDA PLANTS Database. Illinois soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Wild Bergamot in Illinois — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 4-10 (USDA PLANTS Database)
- State Zones: 5a-7a (USDA ARS PHZM 2023)
- Growing Season: Apr 5 - May 10 to Sep 30 - Oct 30 (NOAA Climate Normals)
- Days to Maturity: 120 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Illinois growers also need to think about:
Heavy clay soils in northern IL drain poorly
A raised bed solves the standing-water problem in a weekend; fall compost keeps improving the clay beneath it.
Extreme temperature swings between summer and winter
Wide swings reward truly hardy varieties and a deep mulch blanket — insulation smooths what the weather won't.
Japanese beetles are a major garden pest
Hand-pick into soapy water early and often, and skip the traps (they attract more than they catch) — extension IPM guides have the rest.
Growing wild bergamot here specifically
Illinois's soils run mostly silt loam (Alfisols), and whether that suits wild bergamot's pH 6.5–8.5 preference comes down to your exact parcel, not the statewide picture.
Pull your parcel's SSURGO map unit, test pH, and amend toward wild bergamot's 6.5–8.5 target before planting. How to handle it →
Timing shifts within Illinois
Illinois isn't one climate. In McHenry County, the last hard freeze (28°F) holds until about Apr 5 — roughly 19 days later than the recorded state median — so plant wild bergamot to your county's window, not the statewide date.
County last-freeze dates: NOAA/PRISM Climate Normals 1991-2020, 28°F threshold (earlier than the folk 32°F "last frost"). A parcel report resolves your address's own frost dates.
Pollinator + Wildlife Value
Wild Bergamot draws pollinators (high value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops.
Recommended Wild Bergamot Varieties for Illinois
Illinois publishes no state variety trial for wild bergamot, so we won't invent a "best for Illinois" list. Choose types rated to your USDA hardiness zone (5a-7a), and confirm winter survival and drainage against your own parcel.
Illinois Cooperative Extension
For Illinois-specific cultivar recommendations, planting calendars, and pest pressure for wild bergamot, the canonical source is University of Illinois Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Wild Bergamot native to Illinois?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Wild Bergamot as native to Illinois. Planting it supports the pollinators and wildlife that evolved alongside it.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Wild Bergamot in Illinois
When can I plant Wild Bergamot in Illinois?
Illinois's last spring frost clears between Apr 5 and May 10, and the first fall frost lands between Sep 30 and Oct 30 (NOAA Climate Normals 1991-2020). Wild Bergamot is a long-lived planting, so target spring just after your local last frost — or early fall while the soil holds warmth — and let it establish through the season.
What hardiness zone is Wild Bergamot grown in across Illinois?
Illinois spans USDA hardiness zones 5a-7a (USDA ARS PHZM 2023). Wild Bergamot carries a range of zones 4-10, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Illinois site have?
A typical Illinois site sees ~190 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Wild Bergamot needs 110+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date. In cooler counties like McHenry, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Wild Bergamot native to Illinois?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Wild Bergamot as native to Illinois. Planting it supports the pollinators and wildlife that evolved alongside it.
How should I amend the soil for Wild Bergamot in Illinois?
Wild Bergamot prefers pH 6.5-8.5 (USDA PLANTS Database). That sits in the common-ground band across Illinois soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Wild Bergamot actually grow on my specific land in Illinois?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores wild bergamot against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in Illinois
State-level data is a sketch. Your Growable Ground report scores wild bergamot against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
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
Analysis by the Growable Ground research team, grounded in USDA PLANTS, USDA NRCS SSURGO, NOAA Climate Normals (1991-2020), and named Cooperative Extension sources. How we know →