Fishing on the Saint Vrain has been most productive in town and through Meadow Park. The lower elevation sees earlier bug activity than the canyon stretches higher up. The North fork is starting to be more productive below ButtonRock, but still tough conditions for some(low and clear). The South Fork is only starting to wake up, and may need a few weeks of sun and warmth to turn on. Keep it from Button Rock back towards town for now. Small streamers have worked in deeper pools and runs. Fish are stacked into deeper stretches, while skinny water isn't holding too many fish now. Light nymph rigs with small midges and stones have done good, especially mid day. Dry fly fishing has really picked up over the last week and we are seeing the first olives mixing in with the midges. Small terrestrials are already working as well. The Vrain is another small stream close to the front range with a good pre run off window of opportunity. Fishing can be good through Lyons and east to Longmont as well. Try the access through Golden Ponds this spring.. Small leeches and san juans work well closer to town, and along the front range. Overnight lows are keeping it chilly up the canyon. Try to keep it closer to town if you don't see any bugs. Warm stretches will fish best, cold and snowy days may be a little tougher.