ChloroFileGrow planner
Pick a variety and a sow date and the calendar below shows the whole run against your frost window. Veg length is yours to set on a photoperiod; an autoflower ignores it, which is rather the point of one.
This models a tent or a greenhouse, where you decide when the lights change. A photoperiod planted in the ground ignores your schedule completely and flowers on daylength, so the outdoor date is shown alongside every answer. If you are growing outside, start there instead.
Frost dates are 50%-probability averages. A sheltered, south-facing spot buys you a week or two; a low frost pocket costs you the same. Treat the margin as a planning number, not a guarantee.
Track one of these
ChloroFile carries this whole reference offline. Pick a variety when you add a plant and it fills in the type, seed type, and flowering window, then logs what actually happened against it.