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What to plant in September in Zone 4a

In September, no sowing or transplanting tasks land for Zone 4a from our current crop list — it's typically a growing/harvest month.

Zone 4a frost: last ~05/14, first ~09/27. Dates computed from these and cited extension rules. For your exact town, use the ZIP tool.

Nothing to sow outdoors this month in Zone 4a. Browse the full-year calendar to see what's next.

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Last verified 2026-07-16. Frost: NOAA NCEI 1991–2020. Zone: USDA 2023. Rules: UNH Extension, Johnny's, UGA Extension.