Local planting guide · Midwest
zip 60633
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 averaging -10 to -5°F. The growing season spans 201 days, from a last spring frost around April 11 to a first fall frost near October 31. This narrow window is the defining constraint for home gardeners in the area.
The zone supports reliable growth of hardy tree fruits, particularly apples, pears, and both European and Japanese plums. Peaches and cherries thrive as well, though late-maturing peach varieties can struggle if the season turns cold early. American persimmons offer an alternative for gardeners seeking less conventional crops.
The primary challenge is frost timing. Chicago's springs warm quickly after mid-April, which tempts early planting, but a hard frost in mid-April can still occur and damage tender new growth or blossoms. In fall, frost arrives reliably in late October, cutting the season short relative to more southerly zones. Summer humidity is moderate compared to the Southeast but sufficient to support fungal diseases like fire blight in apples and pears, and leaf spot diseases in cherries and plums.
Gardeners in Chicago have an advantage in winter hardiness; the zone reliably supports trees that fail in milder regions. The trade-off is a compressed planting window and the need for careful variety selection for longer-season crops.
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
Three issues recur for Chicago-area gardeners.
Late-spring frost damage: Warm weather in early April can trigger early bloom in apples, pears, and peaches. A frost event after April 11 is less common but still possible, and when it occurs, it can devastate blossoms and newly leafed-out growth. This is particularly damaging in peaches and Japanese plums, which flush earlier than European varieties.
Fungal disease in humid summers: The combination of moderate summer humidity and warm temperatures creates conditions for fire blight in apples and pears, and leaf spot diseases in cherries and plums. Early-season infections are hardest to control; prevention through good air flow and sanitation is more reliable than attempting to treat established disease.
Season compression: The 201-day growing season is adequate for standard apples and pears but marginal for long-season peach varieties or some Japanese plum cultivars. Late-maturing types can fail to reach proper ripeness or sugar content before the first frost.
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
Mark April 11 as a frost-safety threshold. Resist planting tender annuals like tomatoes and peppers until mid-April, even if warm weather arrives earlier. Frost can still occur through April 10. Similarly, monitor forecasts after trees flush in April; a late frost after bloom can devastate blossoms.
Choose disease-resistant varieties. Fire blight-susceptible apples and pears are a liability in Chicago's humid summers. 'Liberty', 'Priscilla', and 'Enterprise' apples outperform 'Gala' or 'Fuji'. For pears, consider 'Magness' or 'Seckel'. Sour cherry varieties are naturally more disease-resistant than sweet cherries and often thrive with minimal spraying.
Site for air flow. Plant fruit trees where cold air can drain on frosty nights; avoid frost pockets. Good air circulation also reduces disease pressure by drying foliage faster in humid conditions. A south-facing slope is ideal; avoid valley bottoms or north-facing walls.
Frequently asked questions
- What fruit trees are the best choice for Chicago?
Apples, pears, and sour cherries are the most reliable. Both European and Japanese plums do well. Peaches are possible but need hardy varieties like 'Reliance' or 'Contender'. American persimmons offer a less common alternative. All are suited to zone 6a's cold winters.
- When should I plant tomatoes and other tender crops?
Wait until after April 11, the average last spring frost date. For extra safety, delay planting to late April or early May. Frost can still occur through mid-April in some years. Watch the forecast before committing tender plants to the garden.
- What's the biggest seasonal risk for fruit crops in Chicago?
Late-spring frost after bloom. A warm spell in March or early April can trigger early flowering, and frost that follows can destroy the entire blossom crop, resulting in no fruit that year. Plant in locations where cold air drains away at night to reduce frost damage risk.
- Can I grow peaches in Chicago, or are they too risky?
Peaches are possible but require hardy, early-maturing varieties. 'Reliance', 'Contender', and 'Garnet Beauty' are much more reliable than 'Redhaven' or 'Belle of Georgia'. The 201-day growing season is adequate for early types but marginal for late-season varieties.
- Why does humidity cause problems with apples and pears in Chicago?
Fire blight thrives in warm, humid conditions. The disease can devastate an apple or pear orchard if not managed. Plant resistant varieties like 'Liberty', 'Priscilla', or 'Enterprise' apples, and 'Magness' or 'Seckel' pears. Sour cherries and plums are naturally more resistant.
- Is a 201-day growing season long enough for fruit crops?
Yes, for standard apples, pears, plums, and cherries. The season is adequate to reach full ripeness. It's marginal for long-season peach varieties or Japanese plums that mature late in the year. Stick with early to mid-season varieties for best results.
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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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