Onions harvested for their green tops and small bases.
Choose the region that actually covers your garden. These source references are not a nationwide planting calendar.
2–4 weeks before the spring frost reference
The source anchor is the average last spring frost. Use this as an approximate regional starting point.
A NOAA station’s median 32°F freeze date is a different measure. Substituting it is an application calculation, not a published local calendar.
Use the Central North Carolina calendar, with its separate establishment methods. This is not a calendar for every part of North Carolina.
Use the Florida calendar for your specific subregion. Planting months are not interchangeable across the state.
Grouped source row: the calendar covers more than one crop type. It does not establish a separate cultivar-specific schedule.
The source uses an older family classification, so its family label may differ from the one shown here.
Outside these regions? Use your local Extension planting guidance. A nearby weather station describes climate; it does not establish whether or when to plant this crop.
These ranges start at different stages. Keep the method, region, and crop type attached to every number.
Count from setting out transplants. The earlier nursery period is excluded.
Count from seed sown directly in the garden.
A transplant has a head start. Days counted from transplanting leave out time spent raising the seedling. Use a separate seed-starting reference if you plan to raise your own plants.
Maturity references vary with cultivar, harvest size, weather, and establishment method. Keep your seed packet or transplant label alongside the regional calendar.
Published germination minimum · Colorado
A source germination minimum, not an optimum or a transplant threshold; do not treat the number as a guarantee.
Read soil-temperature sourceObserved crop-level tolerance varies with acclimation, cultivar, duration of cold and protection; not a guaranteed survival threshold.
Read the cold-tolerance sourceIf local guidance supports a fall crop, choose a suitable harvest target and count back with the same starting method. The first 32°F freeze is not automatically the right target.
Open the fall plannerFrom direct sowing · Minnesota maturity; Maryland basis convention
This is a planning calculation, not a validated planting window. Transplant-based calculations still exclude nursery time; suitability and the harvest target need local guidance.
Selected source facts reviewed . This is our review date, not the sources’ publication date.
How we use the data