State × crop calendar
Sweet Corn planting in Oregon.
- Primary crop
- Zone 8a
- 185-day season
- Last frost April 20
- Vegetable
- Frost Sensitive
Sweet Corn planting in Oregon is shaped by the state's 8a dominant hardiness zone, last frost date around April 20, and a 185-day growing season. Sweet Corn is widely grown in Oregon — commercially significant or common in home gardens and food plots.
Planting dates on this page are climatological estimates from USDA frost-date norms and zone-typical planting offsets. Verify against OSU Extension Service for variety- and county-specific guidance.
Planting calendar — 2026
Frost-anchored windows.
Sweet Corn · Oregon · planting calendar
Planting windows shift earlier in southern parts of the state and later in northern parts. Use last frost date in your specific county as the reference.
Planting windows
Earliest → ideal → latest.
Spring planting
Sweet CornEarliest
April 13
Ideal start
April 20
Ideal end
May 25
Latest
June 15
Soil-temp trigger
Wait for 55°F at 2-inch depth. Succession plant every 10-14 days for extended harvest.Harvest window
Typical start
June 24
Typical end
July 29
Harvest timing varies with planting date and seasonal weather — these dates are typical for the ideal planting window.
Growing notes
Sweet Corn grows well in Oregon's typical climate. Oregon's 185-day growing season and 8a hardiness zone support reliable production with appropriate variety selection.
Sweet Corn is widely grown in Oregon — commercially significant or common in home gardens and food plots.
Agronomy reference
Sweet Corn fundamentals.
Soil-temp minimum
55°F
Soil-temp optimum
60–85°F
Days to maturity
65–100
Water (in/wk)
1–1.5"
Soil pH
6–6.8
Nitrogen demand
high
Growing-degree-day requirement: 1400 GDD (base 50°F) from planting to maturity.
Succession planting every 2-3 weeks extends harvest. Genotype matters: SU (standard), SE (sugar enhanced), and SH2 (supersweet) varieties have different planting requirements.
Common pests to watch
- Corn earworm
- European corn borer
- Raccoons
Pest pressure varies by region and year. Confirm current outbreaks with OSU Extension Service.
Common diseases
- Stewart's wilt
- Common rust
- Smut
Resistance varieties shift each year. Check the current variety trial report for your state.
Variety selection
Sweet Corn varieties for Oregon live with your extension.
Variety selection
Variety performance is micro-regional and changes with each year's trial cycle. We don't republish variety lists — instead, we point directly at the source.
OSU Extension Service →Search the extension site for “sweet corn variety trial” or “recommended sweet corn varieties” to find the current report.
Yield varies significantly by variety, soil, fertility, and management. Consult your state extension service for variety performance trials in your region.
Sweet Corn timing. Live alerts.
Bield Farm ties weather and soil-temperature stations in your county to crop planting thresholds — get notified the day soil temp clears your target window.
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