Green. Green. Green. Springtime in Forest Park shows you all the shades of green and makes for a perfect time to race on trails that are right in city. The Stumptown Trail Runs include a half marathon on Saturday and a 50K on Memorial Day/Monday. For those not from the area, this is the excuse you were looking for to visit Portland, Oregon. And for those who consider Forest Park their home trails, here’s your chance to race on them.