Room temperature it is! Thanks everyone. And for the last piece of pie, I think I'll try it warm like Amanda did, just for fun.

Depends. Is it a lemon custard pie, or a lemon icebox pie? If the latter, cold; if the former, room temp.

If the flavors are as tangy as lemon should be, your guests will get the fullest taste experience at room temperature.

room temperature!

I usually do room temp but this weekend I served a lemon tart warm and it was really great. Definitely not cold tho!