Don't grow autos outdoors unless you are a fan of waiting 3 months and then harvesting dwarf plants with small yields.
In the same 3 moths you can grow photoperiod fems and harvest 10 times as many buds.
Autos NEED 18/6 to grow properly, something that just isn't achievable outdoors.
Avoid disappointment, avoid autos outdoors would be my advice based on 40 years of outdoor growing and trying autos for 8 years and then deciding to never grow them ever again, they just don't meet my expectations!
Night temps are the biggest enemy when growing outdoors.......wait until overnight temps are hovering around 14-15 degrees before planting seeds.