What kind of overnight temps do you look for before you go camping with a regular 3-season tent? Earliest I've been out in the past was mid-May, but I'm itching to get started a little earlier this year.
Never had anything but a 3 season tent and more often just a tarp and hammock. Spent many nights out with temps in the mid-20's. The warmth of your sleeping bag and pad is more important than your tent. Four season tent mostly comes in to play with snow loads and really windy conditions. Go for it.