Local planting guide · Midwest
zip 60617
Chicago is in USDA hardiness zone 6a, with average winter lows of -10°F to -5°F. The local growing season runs roughly 04/11 through 10/31 (~201 days). This zip falls within the Midwest growing region.
- USDA zone
- 6a -10°F to -5°F
- Last spring frost
- 04/11
- First fall frost
- 10/31
- Growing season
- 201 days
- Compatible crops
- 87
- Growing region
- Midwest
Right now in Chicago
Week 18 priorities
On the docket: transplant out after last frost · direct sow after last frost. See the full calendar →
Gardening in Chicago
Chicago sits in USDA zone 6a with winter lows between -10 and -5°F, putting most commercial and heirloom fruit varieties within reach, though winter cold remains the defining constraint. The proximity to Lake Michigan moderates temperature swings slightly but brings higher humidity and unpredictable lake-effect snow that can damage newly leafing trees in spring. The growing season extends 201 days from the average last spring frost on April 11 to the first fall frost on October 31, a moderate window that suits deciduous fruit trees better than heat-loving crops. Standard zone 6a crops thrive here: apples, pears, peaches, plums, cherries, and persimmons all fruit reliably in most years. The real test is not whether trees survive the winter, but whether they escape the late-spring freeze that often coincides with bud swell in mid-April, and whether the early-October freeze catches them before harvest. Many Chicago gardeners find that season length, not cold hardiness, is the limiting factor.
Regional context · Midwest
What the Midwest brings to Chicago
Continental humid. Cold winters, hot humid summers. Heart of the country's vegetable, sweet corn, and cool-climate fruit production. Michigan and Wisconsin are major fruit states.
Common challenges
Issues that most often defeat home gardeners in zone 6a, drawn from the broader USDA zone profile.
- ▸ Brown rot in stone fruit
- ▸ Japanese beetles
- ▸ Spring frost damage to peach buds
What defeats new gardeners in Chicago
Late-spring frosts remain the most disruptive weather event. April 11 marks the statistical last frost, but frosts into late April are common, sometimes catching fruit tree buds at full bloom or young vegetable transplants just set out. Lake-effect humidity creates persistent fungal pressure, particularly fire blight on pears and apples in wet springs, and powdery mildew on many crops in humid summers. The early October frost date cuts short the harvest window for heat-demanding crops like tomatoes, peppers, and long-season squash. Soil in much of the Chicago area is heavy clay with poor drainage, limiting root crops and creating waterlogging risk in wet years. Deer and rabbit pressure in suburban areas remains consistently high, requiring either fencing or deer-resistant variety selection.
Crops that grow in Chicago
87 crops from our catalog match zone 6a, grouped by type.
Tree fruit
12 crops
zone 6a Apple
Malus domestica
zones 3a–9a
zone 6a Pear
Pyrus communis
zones 4a–8b
zone 6a Peach
Prunus persica
zones 5a–9a
zone 6a European Plum
Prunus domestica
zones 4a–8a
zone 6a Japanese Plum
Prunus salicina
zones 5b–9a
zone 6a Sweet Cherry
Prunus avium
zones 5a–8a
zone 6a Sour Cherry
Prunus cerasus
zones 4a–7b
zone 6a American Persimmon
Diospyros virginiana
zones 4b–9a
Berries
20 crops
zone 6a Highbush Blueberry
Vaccinium corymbosum
zones 4a–7b
zone 6a Lowbush Blueberry
Vaccinium angustifolium
zones 3a–6b
zone 6a Red Raspberry
Rubus idaeus
zones 3b–8a
zone 6a Black Raspberry
Rubus occidentalis
zones 4a–8a
zone 6a Yellow Raspberry
Rubus idaeus
zones 3b–8a
zone 6a Blackberry
Rubus subgenus Rubus
zones 5a–9a
zone 6a June-Bearing Strawberry
Fragaria x ananassa
zones 3a–8b
zone 6a Everbearing Strawberry
Fragaria x ananassa
zones 3b–9a
Nuts
6 crops
Vegetables
40 crops
zone 6a Tomato
Solanum lycopersicum
zones 3a–10b
zone 6a Sweet Pepper
Capsicum annuum
zones 4a–10b
zone 6a Hot Pepper
Capsicum species
zones 4a–10b
zone 6a Eggplant
Solanum melongena
zones 5a–10b
zone 6a Potato
Solanum tuberosum
zones 3a–9a
zone 6a Cabbage
Brassica oleracea var. capitata
zones 3a–9b
zone 6a Broccoli
Brassica oleracea var. italica
zones 3a–9a
zone 6a Cauliflower
Brassica oleracea var. botrytis
zones 3b–9a
Herbs
9 crops
zone 6a Basil
Ocimum basilicum
zones 4a–10b
zone 6a Parsley
Petroselinum crispum
zones 3b–9b
zone 6a Cilantro / Coriander
Coriandrum sativum
zones 3b–9b
zone 6a Dill
Anethum graveolens
zones 3b–9a
zone 6a Oregano
Origanum vulgare
zones 4a–9b
zone 6a Thyme
Thymus vulgaris
zones 4a–9a
zone 6a Sage
Salvia officinalis
zones 4a–9a
zone 6a Mint
Mentha species
zones 3b–9b
Plan the year
Planting calendar for Chicago
Year-view of seed starting, transplanting, planting, pruning, fertilizing, harvest, and pest-watch windows tuned to Chicago's local frost dates.
Week ? · loading
This week in Chicago, IL (zone 6a)
Quiet week in Chicago, IL (zone 6a). this week is a good time to step back and plan ahead.
Nothing critical on the calendar this week.
434 bars · 87 crops
Calendar logic combines NOAA frost normals with crop-specific timing data. Local microclimate and weather always overrules the calendar; use this as a starting point.
Top pests for zone 6a
Ranked by how many crops in your zone they affect. Click through for IPM controls and signs to watch for.
Multiple species (Aphididae)
Small soft-bodied sap-sucking insects that reproduce explosively in spring. Excrete honeydew that supports sooty mold and attracts ants. Transmit viral diseases.
Odocoileus species
Whitetail and mule deer browse can devastate orchards and gardens, particularly in winter when food is scarce. Antler rub on young trunks kills saplings outright.
Multiple species
Robins, catbirds, mockingbirds, starlings, cedar waxwings and other songbirds can strip ripening berry and fruit crops in days. Crows and blackbirds also damage fresh sweet corn ears in milk stage. The single biggest yield-loss factor in unprotected home plantings.
Sylvilagus and Lepus species
Cottontails and jackrabbits strip bark from young fruit trees in winter and graze tender garden vegetables year-round, especially seedlings.
Popillia japonica
Defoliating beetle introduced to North America in 1916. Skeletonizes leaves of many fruit trees, berry canes, and pecan.
Multiple species (Chrysomelidae)
Tiny black or bronze jumping beetles that put hundreds of small holes in seedling leaves. Most damaging on direct-seeded brassicas and young eggplant.
Tetranychus urticae
Tiny mite that feeds on leaf undersides, causing stippling and webbing during hot dry weather.
Microtus species
Field voles and meadow voles girdle young fruit-tree trunks under snow cover during winter and chew root crops. The leading cause of mysterious orchard losses.
Top diseases for zone 6a
Ranked by how many crops in your zone they affect. Click through for symptoms, controls, and resistant varieties.
Botrytis cinerea
Ubiquitous fungal disease that causes fruit rot during cool wet weather, often the dominant berry disease in humid regions.
Pseudoperonospora cubensis (cucurbits) and others
Water mold (oomycete, not a true fungus) that thrives in cool damp conditions. Spreads rapidly through cucurbit and brassica plantings on wind-borne spores.
Pythium and Rhizoctonia species
Soil-borne complex of water molds and fungi that kill seedlings before or shortly after emergence. The single most common cause of seed-starting failures.
Cucumber mosaic virus, Tobacco mosaic virus, and others
Family of plant viruses producing mottled yellow-and-green leaf patterns. Vectored primarily by aphids; some are seed-transmitted or spread by handling tools and tobacco products.
Agrobacterium tumefaciens
Soil-borne bacterium that enters plants through wounds and induces tumor-like galls on roots, crown, and lower stems. Galls reduce vigor and shorten plant lifespan; on Rubus the disease is often fatal.
Fusarium oxysporum
Soil-borne fungal disease that plugs vascular tissue and kills affected plants. Persists in soil for many years; impossible to eliminate once established.
Sclerotium rolfsii
Soil-borne fungal disease most damaging in warm humid Southern conditions. White mycelial fans and small mustard-seed-sized sclerotia at the soil line are diagnostic.
Plasmodiophora brassicae
Soil-borne disease causing characteristic distorted club-shaped roots on brassicas. Persists in soil for 10-20 years; the dominant brassica pathogen in acidic poorly-drained soils.
Companion planting suggestions
Beneficial pairings drawn from companion data, filtered to crops that grow in zone 6a.
- Peach + Garlic
Garlic planted around peach trees suppresses peach borer and provides general fungal-pressure reduction.
- European Plum + Garlic
Garlic discourages plum curculio and provides general antifungal benefit beneath stone fruit.
- American Persimmon + Pawpaw
Both natives thrive in similar soils and contribute to a polyculture that supports native pollinators and fauna.
- Jujube + Thyme
Thyme groundcover suits jujube's low-water profile and deters cabbage moth and aphid populations.
- Apricot + Basil
Basil's volatile oils discourage stone-fruit pests and support pollinator visits.
- Highbush Blueberry + Thyme
Creeping thyme thrives in the acidic mulched conditions blueberries require and attracts pollinators during bloom.
Soil types reference
Soil texture and pH decide what grows easily on your specific lot. Find the closest match below for crop recommendations and amendment guidance.
Practical tips for Chicago
Delay planting frost-sensitive crops (tomatoes, peppers, basil) until after May 1 to avoid the late April frost dip, even though the calendar says April 11 is the average last frost. Many gardeners lose transplants in this window year after year by planting too early. Choose fire-blight-resistant apple and pear varieties (Seckel and Moonglow for pears; Liberty, Priscilla, and Enterprise for apples) to reduce spring disease pressure from the humid lake-effect environment. For long-season crops like tomatoes and peppers, start seeds indoors in late March and transplant to the garden by May 15, allowing 130 to 140 days for fruit development before the late-October frost.
Frequently asked questions
- What fruit trees are most reliable in Chicago?
Apples, pears, peaches, European and Japanese plums, sour and sweet cherries, and American persimmons all grow well in zone 6a. Disease resistance matters more than cold hardiness here; choose fire-blight-resistant pear varieties and scab-resistant apples.
- When should I transplant tomatoes outdoors?
Wait until after May 1. Although April 11 is the average last frost date, late April freezes are common in Chicago and will kill young tomato plants. Starting seeds indoors in late March gives transplants time to mature before the October 31 first frost.
- What is the biggest weather risk for gardeners in Chicago?
Late-spring frosts occurring after April 11 can damage fruit tree buds at bloom, and early-October frosts near October 31 cut short the harvest window for heat-demanding crops. Both require careful variety selection and frost-protection planning.
- How do I manage heavy clay soil?
Amend with 2 to 3 inches of compost each year to improve drainage and structure. Consider raised beds for root crops and vegetables. Avoid working clay when wet, as it compacts easily. Drainage tiles or French drains help if waterlogging is severe.
- Which crops struggle most in Chicago's climate?
Long-season heat-lovers like okra, southern peas, and sweet potato rarely mature before frost. Late crops planted in July (fall broccoli, cabbage) often succeed better than spring planting due to the early October frost. Humidity favors fungal diseases on squash and cucumbers.
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Frost data: NOAA Climate Normals 1991-2020, station USW00014819. Local microclimates can shift these dates by a week or more.
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