Sea ice is a crucial, yet declining, habitat in high latitude ecosystems. Here we present a high‐temporal resolution amplicon sequence data set collected during the spring ice‐algal bloom near Utqiaġvik, Alaska in 2021 to study sea‐ice microbial dynamics. The ice‐algal bloom peaked on May 8th, reaching 46.6 mg chlorophyll a m −2 and thereafter became limited by nitrate availability. A massive bloom of the oil‐degrading bacteri...