I just moved to Bellingham this winter and I’ve found a couple steep routes at Lookout MT and Lake Whatcom Park. They were mostly mountain bike trails, so the terrain is loose at times and I had to bear crawl up some of it. Great views of Baker and the Sisters in a clear cut at Lookout and Whatcom’s Chanterelle trail is definitely a place I’d like to do some laps on this spring. Did both before the snow hit, so not sure what the conditions are now. It’s on my Strava if you want to check it out. Good luck!