How late can I sow a crop and still harvest before winter?

Until the end of the crop’s Optimal Growing Period on your farm, and Heirloom shows you that week on one curve, so your last fall sowings are no longer a guess. In Charts, open Direct seeding or Transplantation, then click the curve icon in the Climate-adjusted DTM column on the crop’s row.

The Optimal Growing Period band shows the weeks when a sowing reaches maturity without too much cold, heat or frost, and the Light Frost and Hard Frost bands show your frost dates. Toward fall the curve climbs: each later week adds days before harvest. The steps are in Read a crop’s DTM curve.