Onion Garden Planner for Canning

Plan bulb onions for canning, compare planting systems, and choose a day-length type suited to your latitude.

Your growing location

Hardiness zone describes winter minimum temperature. It does not replace frost dates, day length, soil temperature, or current weather.

Nothing is shared until you choose a lookup button. ZIP lookup uses PHZMAPI. “Use my location” sends coordinates to BigDataCloud only to obtain a ZIP, then sends that ZIP to PHZMAPI; coordinates are not stored by this site.

Verify the result on the official USDA 2023 map; manual override always remains available.

Plants and space calculator

Space by planting style

Preservation-suitable variety direction

Zone is only one factor. Day length, disease pressure, storage quality, maturity, and use may be more important.

Short-day onions

Usually best at lower latitudes; choose a firm storage or processing cultivar recommended locally.

Intermediate-day onions

Often suited to middle latitudes; confirm local adaptation, disease resistance, firmness, and storage life.

Long-day onions

Usually best at higher latitudes; storage types suit a harvest held for later canning.

Planting and indoor-start timing

Start seed about 10–12 weeks before transplanting where the cited northern guidance applies. Check local frost, soil, and forecast conditions.

Current weather is not loaded automatically; check the local forecast and soil before planting.

Canning recipes using onions

Sources, formulas, and limits

Plants = household annual target ÷ selected yield per plant, rounded up. Area or row units = target ÷ compatible cited yield, rounded up. “Typical” uses the cited midpoint.

University of Minnesota Extension crop and field planning data

USDA 2023 Plant Hardiness Zone Map

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