Autoflower temperature ranges

I'm curious if anybody knows the definitive answer from experience, the temperature ranges it's safe to expose autoflowering strains to.. I know we've had outdoor autos survive and still thrive after frosts in early may and handle 100 °day time temps with 95% humidity all darn day. but I'm not sure if what was ok for one strain of auto would work for others? I once read below 60° will kill them and that's not near truth from any tent grows ive had but should I panick if I know it's gonna hit 40 in my tent a few nights here or there... ?.. thanks in advance

id say 50-95 as a general wide range rule of thumb for decent growth, and add variation either way depending on lineage (especially where the auto genes came from). For example an Nepalese indica mixed with siberian ruderalis will deal with sub zero temps where as something like an AK420 auto (columbian, mexican and thai sativa cross afghan indica and khazak ruderalis) will do far better in warmer climates. Knowing geographic heritage is important in this regard. I generally stick to the 60-90 rule myself when i can, but have happily gone down to 45 nights with no issues and upwards of 105 with a bit of wilting by the end of the day.

Thanks man. The weather here's been warming and I get so much more light from the sun versus my tent... I just have other photos on 12 /12 in my tent and the tent I've had these autos in has gotten to crowded in preparation for summer plants. I'm still toying with 24-7 lighting versus 18-6 etc on autos. Any recommendations?

I generally run 20/4 with my autos but run the light dimmed to 70% to keep temps acceptable without ac.

I'd say as long as your DLI is around 40-50 while flowering you should be good regardless of lighting duration.

I'd like to try 24/7 myself beside a 18/6 at the same DLI to see if there is any difference due to duration, even at the same DLI.

something to keep in mind, the roots are more prone to taking damage from cold. You can get away with lower air temps if you keep your pots warm. Wrapping an insulator around the pots will do wonders in low temps.