Blueberry production in Illinois
The 2022 USDA Census recorded 151 Illinois farms and 188 acres of tame blueberries. A northern Illinois field report adds one local 2025 harvest observation. Use the Midwest production guide for field layout and crop management; neither source establishes a statewide yield forecast or calendar.
Scope: Illinois farm counts and one northern Illinois commercial season, paired with regional Midwest production recommendations. Regional management figures are benchmarks, not Illinois trial results. Updated 2026-10-03.
At a glance
- Tame-blueberry acreage, 2022
- 188 acres statewide, including 164 bearing acres1
- 2025 northern Illinois season
- A field report said harvest began around 4 July and lasted roughly 5–6 weeks2
- Production pH target
- 4.5–5.0 in the Midwest guide; confirm with a soil test3
- Commercial row layout
- 3.0–3.7 m (10–12 ft) rows; 0.9–1.5 m (3–5 ft) within rows3
- Supplemental water
- 1–1.5 in (25–38 mm) per week may be needed during fruit expansion and harvest3
Perennial growth and climate in Illinois
A perennial planting remains in the field for multiple years. Establishment is a long-term investment; flowering, fruit development, harvest and plant care recur as the planting matures. Follow the named cultivar and production system.
Establish a long-lived planting3
Test and prepare acidic beds, choose cultivars suited to winter exposure and establish mulch and irrigation for a perennial commercial field.
Management: Manage by crop stage3
Schedule dormant pruning, bloom monitoring, fruit-fill irrigation and postharvest care from actual plant development and local cultivar records.
Management: Flower-bud formation: Midwest reference3
The commercial Midwest guide places flower-bud formation in September–October. Maintain healthy foliage and water supply during this stage.
Harvest: Northern Illinois farm observation2
A 2025 northern Illinois commercial report described a 4 July harvest start and a five-to-six-week picking season. July–August reflects that farm and year, not all Illinois cultivars.
Historical monthly climate
Reference period: 1996-01-01 to 2025-12-31. ERA5-Land monthly mean soil temperature at 0–7 cm, air temperature and frost days at the regional reference point (40, -89). Select a month to inspect its historical conditions.
Month tiles show mean air temperature.
September historical conditions
- Mean topsoil temperature
- 21.7°C
- Mean air temperature
- 20.8°C
- Mean frost days per month
- 0.0 days
Use this monthly history to assess winter exposure, seasonal heat and water planning. It does not calculate cultivar chill hours, flowering dates, frost damage during bloom or fruit maturity. Topsoil at 0–7 cm describes shallow soil context, not the full root zone. Harvest periods follow the production evidence above.
Climate source: Open-Meteo Historical Weather APISeparate statewide production from one local season
- Reported duration5–6 weeksThe field report says harvest began around 4 July.
Between rows: 10–12 ft (3.0–3.7 m) · Within the row: 3–5 ft (0.9–1.5 m)
Regional guide benchmark. Adjust for cultivar size and equipment; it is not an Illinois trial layout.
- Statewide crop activity
- The 2022 USDA Census recorded 151 Illinois farms and 188 acres of tame blueberries, including 164 bearing acres. These totals show crop activity, not a standard production system.1
- Northern Illinois observation
- An Illinois Extension commercial-grower update reported that its northern Illinois season started around July 4 in 2025 and ran about five to six weeks. It also described blueberries as a niche crop in the area. Treat that as one season and one part of the state.2
Screen soil and drainage before planting
- Acid soil
- The Midwest production guide targets pH 4.5–5.0. Test the proposed field early and calculate amendment rates from the soil report.3
- Prepare ahead
- Soil acidification is slow and may take months. Begin field preparation well before planting, retest after amendments and avoid transferring a rate from a different soil texture.3
Set the production layout and planting window
- Spacing
- The regional guide gives 10–12 ft between rows and 3–5 ft between plants. It reports about 1,450 plants per acre at 10 × 3 ft; change the layout for cultivar size and equipment.3
Manage irrigation, nutrition and crop health
- Irrigation
- The Midwest guide says supplemental 1–1.5 inches of water per week is often needed, especially from fruit expansion through harvest. Adjust for rainfall and soil moisture, and plan water capacity before planting.3
- Nutrition
- Use soil and leaf tests to set fertilizer rates. Excess nitrogen can drive dense growth and raise disease pressure; avoid late-season nitrogen.3
- Weeds and disease
- Control persistent weeds before planting, keep rows manageable and maintain air movement through the crop. Use current Midwest crop-protection guidance for any pesticide decision.3
Use local cultivar observations cautiously
- Northern Illinois examples
- The 2025 report mentions farms growing Patriot, Spartan, Bonus, Blueray and Bluecrop. The article records varieties observed in the region; it is not a replicated cultivar trial or a statewide ranking.2
Use 2025 dates as an observation, not a forecast
- Northern season
- The northern Illinois field report places the 2025 start around July 4 and describes a five- to six-week picking season. Weather, cultivar mix and location can shift future seasons.2
- Harvest handling
- The Midwest guide recommends frequent picking, gentle handling and prompt cooling to about 0–2°C (32–35°F). Plan labor, containers and cooling capacity ahead of harvest.3
Frequently asked questions
- Are blueberries grown commercially in Illinois?
- Yes. USDA’s 2022 Census recorded 151 farms and 188 acres of tame blueberries. A 2025 northern Illinois Extension report describes the crop as a niche locally.
- What pH should an Illinois blueberry field target?
- The Midwest production guide targets pH 4.5–5.0. Test the field early and set amendment rates from the soil report.
- When are blueberries harvested in Illinois?
- A northern Illinois report said the 2025 season started around July 4 and lasted about five to six weeks. It is one local season, not a statewide calendar.
- How much water do Illinois blueberry fields need?
- The Midwest guide says supplemental 1–1.5 inches (25–38 mm) per week is often needed from fruit expansion through harvest. Adjust for rain and soil moisture.
- What yield can an Illinois blueberry farm expect?
- The reviewed sources do not establish an Illinois commercial yield target. Census acreage and one field report are not enough to estimate a new farm’s yield.
Regional blueberries guides
Local dates, soil-temperature history and sources for specific regions:
Sources and image credits
- 1. USDA NASS — 2022 Census of Agriculture, Illinois, Table 38: Berries by Acres — Published 2024; 2022 data. Illinois tame-blueberry farm counts and acreage.
- 2. Illinois Extension — From Northern Illinois (Rockford): Apple fruit quality looks great this season — Published 30 July 2025. A northern Illinois commercial field observation on blueberry season timing, local farms and varieties.
- 3. University of Kentucky Cooperative Extension — ID-210 Midwest Blueberry Production Guide — Issued July 2013. Midwest commercial recommendations for field layout, soil preparation, irrigation, crop management and harvest.
Image credits
- A fruiting blueberry bush with mulch and drip irrigation.
- Blueberries need an acidic, organic root zone. Schematic illustration.
- Inspect fruit for damage as it ripens.
Figures are published averages or study assumptions for the places named, not guarantees for your field. Check current local recommendations and product labels before acting.
Some visuals in this guide are illustrations rather than photographs of a specific farm. See image credits.