The Sunscreen Challenge aimed to get six people to start wearing sunscreen daily over seven days. Participants were given travel-sized sunscreen bottles and instructed to place them near their morning routines. Daily email surveys found that attaching sunscreen to existing routines like medications led to near-perfect compliance. Email triggers also prompted sunscreen application. Free sunscreen saw higher usage than personal bottles. Future work could include UV index data in emails and pair participants for accountability. Though habits did not fully form, some continued sunscreen use on sunny days, showing that habit formation may be possible within a week.