Local planting guide · Midwest
zip 60655
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's zone 6a climate revolves around two hard boundaries: winters that reach -5 to -10°F and a growing season of roughly 201 days bounded by April 11 spring frost and October 31 fall frost. This relatively short window makes timing critical but also reliable. The fruit crops that thrive here, apples, pears, peaches, both European and Japanese plums, sour and sweet cherries, and American persimmons, reflect the zone's strength in stone fruits and pomaceous varieties that demand adequate winter chilling (300 to 1,200 chill hours depending on variety). Chicago's position near Lake Michigan provides some moderating effect on extreme temperatures but also increases humidity during the growing season, a trade-off that affects disease risk more than frost risk. Gardeners here rarely face the season-extension challenges of zone 5, but also cannot grow the heat-lovers that zone 7a gardeners manage. The defining constraint is not length but the abruptness of the transitions: frost comes early in fall, and spring bloomers must wait until mid-April to avoid damage.
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
Chicago's dominant growing-season challenge is late-spring frost damage to fruit blossoms. Trees that bloom in March or early April, particularly susceptible are apricots, early-flowering peach varieties, and sweet cherries, often face freezes after budbreak, eliminating the crop for that year. Humid summers create secondary pressure from fungal diseases, especially on stone fruits: brown rot on peaches and plums, leaf curl on cherries, and fire blight on pears and apples. Winter hardiness is equally non-negotiable; varieties rated for zone 6b or warmer will not reliably overwinter. Deer pressure in suburban Chicago is often underestimated by newcomers; young fruit trees face repeated browsing damage without fencing or repellent.
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 varieties to avoid the April 11 frost date. Delay-bloom peach and plum varieties are worth the extra cost, and pear varieties that bloom after apple tend to escape frost damage more reliably. Plan fall planting around the October 31 first-frost date; start seeds for fall crops by late summer so they mature before the hard freeze. In humid Chicago summers, prune for canopy airflow and monitor stone fruits weekly during June and July for brown rot or leaf curl; early removal of affected fruit prevents spread better than dormant-season sprays.
Frequently asked questions
- What fruit crops are most reliable for Chicago gardeners?
Apples, sour cherries, and pears are the hardiest and most forgiving for zone 6a. European plums are also reliable if a late-blooming variety is chosen. Peaches and sweet cherries require more attention to variety selection and frost protection but are entirely feasible with careful cultivar choice.
- When is the last safe date to plant tender crops like tomatoes in Chicago?
The last spring frost is April 11, so wait until mid-April to transplant tomatoes and other frost-tender vegetables into the ground. Starting seeds indoors 6 to 8 weeks before that date (early March) gives transplants time to reach proper size.
- What is the biggest weather risk for fruit crops in Chicago?
Late-spring frost after bud break, especially for early-blooming stone fruits. A freeze in April can eliminate the entire crop. Delaying bud break through variety selection (later-blooming cultivars) or microclimate management (north-facing walls, raised beds on higher ground) is the most reliable defense.
- How do I protect my fruit trees from harsh Chicago winters?
Choose varieties rated for zone 6a hardiness. Newly planted trees benefit from mulch mounding in late autumn (remove in early spring). Avoid late-season nitrogen fertilizer, which encourages tender growth. Most established zone 6a-rated varieties need no winter protection beyond careful cultivar selection.
- Are there ways to extend the growing season beyond October 31?
The October 31 frost date is firm for outdoor crops. Row covers extend fall growing by 2 to 4 weeks on greens and other cold-tolerant crops, but outdoor tree fruit harvest must finish before the hard freeze.
- What fungal diseases should I watch for in Chicago's humid summers?
Brown rot is the most common and damaging on stone fruits; scout peaches and plums weekly in June and July and remove infected fruit immediately. Leaf curl affects peaches and cherries. Fire blight can strike pears and apples during warm, wet springs. Preventive canopy pruning for airflow reduces disease pressure more effectively than sprays.
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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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