Your seed packet gives you a growing timeline. A local freeze-date guide helps you put that timeline on the calendar.
Choose an outdoor target first
Look up your location and choose a historical risk level. Then consider the crop: a warm-season transplant may need warmer nights and soil even after the selected freeze date. Use your packet and local extension recommendations to decide how much additional time to allow.
Subtract the indoor growing period
Subtract the recommended indoor growing time from your outdoor target. If your chosen target is May 15 and your packet calls for six weeks indoors, count back 42 days. Our planner performs this arithmetic without treating one schedule as right for every crop.
Leave room for hardening off
Seedlings raised indoors need a gradual transition to outdoor light, wind and temperature. Follow local guidance and bring tender plants back inside when conditions require it. A fixed calendar cannot replace observing your plants.
Start with a simple setup
Use clean containers with drainage, an appropriate seed-starting mix and sufficient light. Read the seed packet for germination needs. A soil thermometer can help you make better outdoor decisions than a date alone.
Further reading
University of Maryland Extension: Starting vegetable seeds indoors
University of Minnesota Extension: Starting seeds indoors