Green-up Day icefogger 3 years ago Photo credit: NWS-Fairbanks; University of Alaska – Fairbanks campus The phenomenon known as Green-up occurred on May 16 this year. In one day, the tree buds burst open, giving the hills around Fairbanks a very sudden green tint. It’s eight days later than the average green-up. Share this: Share on Facebook (Opens in new window) Facebook Share on Pinterest (Opens in new window) Pinterest Email a link to a friend (Opens in new window) Email