Local planting guide · Midwest
zip 60623
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 degrees Fahrenheit. The growing season spans 201 days, from April 11 (last spring frost) through October 31 (first fall frost). This window is long enough for a broad range of fruit trees and hardy crops, though the variable spring weather characteristic of the upper Midwest can complicate timing. Fruit trees thrive in Chicago's climate. Apples, pears, peaches, both European and Japanese plums, sweet and sour cherries, and American persimmons all produce reliably. The Lake Michigan influence moderates winter extremes somewhat but also introduces humidity and occasional unpredictable warm spells followed by hard freezes. The growing season length is sufficient for most stone fruits to mature, though very late-ripening or heat-demanding crops may need variety selection for local conditions. Chicago's alkaline soil (often clay-heavy near the city) is suitable for most fruit trees but benefits from soil testing and amendment.
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 a persistent threat. April 11 is the statistical average for the last hard freeze, but Chicago springs are variable. Fruit trees may break dormancy during warm spells in March, then sustain damage when frost returns. Summer humidity drives fungal disease pressure. Apple scab, cedar apple rust, and powdery mildew thrive in the warm, moist conditions. Pest pressure includes Japanese beetles, sawfly larvae on fruit, and rodent damage in winter, particularly vole damage under mulch. Winter weather is unpredictable. While zone 6a is generally winter-hardy territory, fluctuations (warm December, then severe cold) can exhaust trees. Marginally hardy varieties may not survive every year.
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
First: delay planting tender trees and moving bare-root stock outdoors until after April 11 to minimize frost damage risk. Early-blooming fruit tree flowers are vulnerable to late freezes; selecting later-blooming varieties or being ready with frost cloth for critical nights reduces crop loss. Second: prioritize disease-resistant varieties for summer. For apples, choose cultivars with scab and rust tolerance rather than relying on spray programs. Third: manage fall color and disease in late summer by improving air circulation around trees, removing fallen fruit (source of disease spores), and applying dormant oil in late fall to suppress overwintering pests.
Frequently asked questions
- What fruit trees grow best in Chicago?
Apples, pears, both European and Japanese plums, sweet and sour cherries, peaches, and American persimmons all thrive. Cold-hardy apple varieties (Honeycrisp, Gala, Fuji if grafted on cold-hardy rootstock) are reliable. Peaches require microclimate protection; sour cherries are hardier than sweet cherries in variable winters.
- When is the last frost date in Chicago?
April 11 is the statistical average based on NOAA Climate Normals 1991-2020. This is the date to plan around for planting tender annuals, starting seeds outdoors, or moving nursery stock outside. Actual frost can occur later, especially in zone 6a; track local forecasts in late March and early April.
- How do I protect fruit trees from late spring frost?
Avoid planting in frost pockets (low spots where cold air pools). For blooming trees, frost cloth or sprinkler irrigation (running water freezes and releases heat) can save crop on critical nights. Prune trees to delay bloom slightly by choosing less vigorous growth that leafs out later.
- What's the biggest weather risk for Chicago gardeners?
Variable spring weather is the primary challenge. Warm spells in March encourage early bloom, then hard frosts return. Summer humidity drives fungal disease. Winter cold is less extreme in zone 6a than the far north, but fluctuating temperatures can stress marginally hardy varieties.
- When should I start vegetable seeds indoors in Chicago?
Count back 6 to 8 weeks from April 11. Start cool-season brassicas (cabbage, broccoli) in late February. Start warm-season crops (tomatoes, peppers) in mid-March for transplanting after April 11. Direct-seed cool crops (spinach, lettuce) in March; warm crops (beans, squash) in May after soil warms.
- Can peaches really grow in zone 6a?
Yes. Peaches are winter-hardy in zone 6a where low temperatures average -10 to -5°F. Plant in a protected south-facing microclimate with good drainage. Susceptible to spring frost if they bloom early; selecting later-blooming varieties reduces risk. Summer humidity can drive fungal disease, so choose disease-resistant cultivars where available.
+−
+−
+−
+−
+−
+−
Frost data: NOAA Climate Normals 1991-2020, station USW00014819. Local microclimates can shift these dates by a week or more.
Related