Mine begin to bloom indoors in March, although these initial flowers usually won't set fruit.
Sometimes, peppers will become even more prolific as they age.

I prune my pepper plants in the Fall and bring them indoors for the Winter. In
May, they go right back out into the garden. If you keep your peppers in a container,
it would be a good idea to prune and root-prune your plants after the final harvest,
and provide new potting mix. I use a mix of bark, perlite, pumice, and gravel....
so that my plants won't suffer root-rot during the cold, dim days of Winter.

Josh

I've included the link that inspired me to grow Peppers for the first time last
year. I don't like eating peppers all that much, but I do love bonsai and plants
in general.

Josh