Name: Sandy B. Ford River Twp, Michigan UP (Zone 4b) (Zone 4b-maybe 5a)
For the size pots they are in I don't know why you would need to transplant them, they should be fine until you plant them out. (I start my peppers in 6-packs (8 packs/flat) then pot up to 3-inch pots, then outside).
“Think occasionally of the suffering of which you spare yourself the sight." ~ Albert Schweitzer C/F temp conversion