Local planting guide · Midwest
zip 60642
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 gardeners work within a 201-day growing season bounded by an April 11 last spring frost and an October 31 first fall frost. Winter lows between -10 and -5°F define the upper limit for perennial crops, making stone fruits, pears, and apples the reliable anchors of a home orchard. The dominant constraints are the late spring frost, which can catch early-blooming varieties like peach and sour cherry, and the relatively early fall frost that abbreviates the season compared to southern zone 6a locations. Summer humidity presents a secondary challenge: the Lake Michigan effect creates moisture that favors fungal diseases like apple scab, powdery mildew, and cherry leaf spot. Soil in the Chicago area tends toward heavy clay, which drains poorly in spring and becomes rock-hard in drought. Despite these pressures, the zone rewards gardeners who select late-blooming and disease-resistant varieties. European plums, sour cherries, and disease-resistant apple rootstocks thrive in Chicago's climate and are less demanding than the tender crops that fail at the temperature extreme.
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 frost is the most damaging single weather event for Chicago fruit growers. Peach and sour cherry buds often break in early April in response to warming, then freeze in the April 11 frost window, eliminating the entire crop. Japanese plums are particularly vulnerable. Choosing late-blooming varieties (typically 1–2 weeks later than standard types) mitigates this significantly but requires careful variety research. Summer humidity creates year-round fungal pressure: apple scab infections explode in wet springs, powdery mildew thrives in warm, humid summers, and cherry leaf spot defoliates trees by mid-season. Chicago's heavy clay soil compounds the problem by retaining moisture around tree bases, creating ideal conditions for root rot and crown rot if drainage isn't engineered.
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
Select late-blooming peach and plum varieties that break dormancy after April 11 for consistent production. 'Reliance' peach and late-blooming Japanese plums such as 'Shiro' are proven choices in Chicago gardens. Second, plant disease-resistant apple varieties and rootstocks designed for humid climates. M.7 and M.26 rootstocks establish better in heavy clay than dwarfing options, and scab-resistant varieties like 'Liberty', 'Priscilla', and 'Enterprise' reduce the fungal disease pressure that builds through wet springs and humid summers. Third, delay planting tender annuals like tomatoes, peppers, and basil until mid-May. Although the average last frost is April 11, Chicago's heavy clay soil warms slowly, and early transplanting usually results in stunted growth.
Frequently asked questions
- What fruit trees grow best in Chicago?
Apples, pears, sour cherries, and disease-resistant European plums are the most reliable. Sour cherries tolerate the cold and humidity better than sweet cherries. Peaches and Japanese plums require late-blooming varieties to avoid spring frost damage. American persimmons are worth trying but marginally hardy at the zone 6a extreme.
- When should I plant tomatoes, peppers, and basil in Chicago?
Wait until mid-May, about two weeks after the April 11 average last frost date. Planting earlier often results in transplant damage or stunted growth. Soil temperature should be at least 60°F for tomatoes to grow actively; Chicago soil often doesn't reach that until late May.
- Why do my peach blossoms freeze in spring?
Peach buds break dormancy in early April when temperatures warm, then the April 11 frost kills the tender flowers and fruit buds. Plant late-blooming varieties like 'Reliance' that delay bud break until after the frost window. Standard early-blooming peaches rarely produce fruit in Chicago.
- What's the biggest weather risk for a Chicago garden?
Late spring frost in early-to-mid April is the single biggest threat. It kills fruit buds on early-blooming stone fruits and can damage tender perennials and vegetables. The secondary risk is early fall frost on October 31, which ends the season abruptly.
- How do I manage heavy clay soil?
Add 3–4 inches of compost or aged mulch to improve drainage and encourage root development. For fruit trees, plant on a slight mound to keep the graft union well above the soil line, reducing crown rot risk. Avoid compacting soil in early spring when it's wet.
- How can I reduce apple scab and powdery mildew?
Plant disease-resistant apple varieties like 'Liberty', 'Priscilla', or 'Enterprise' instead of susceptible types. Prune for airflow to reduce humidity around the canopy. Rake fallen leaves in fall to remove overwintering fungal spores.
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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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