Autos can be started outdoors any time the nights stay warm, which allows two or even three harvests per season in mild climates. In cooler regions the window is narrower, but a mid May start still finishes comfortably by August. The outdoor auto calendar on High THC Seeds: 20–33% Cannabis Strains Explained gives suggested start dates by region and notes how frost dates affect the last possible planting. Planning two staggered auto runs is a practical way to use a short summer.