ice fishing in march, high country (mountains) only, all front range lakes are usually open by them. some of the high country lakes may be a bit touch and go depending upon the time in march and year weather wise.
fly fishing, rivers, well the tail waters should be doing okay in march. such as cheeseman canyon, fryingpan, williams fork, bit thompson. some of the freestones should have some open water - again depending upon the year and the weather.
fly fishing will maonly be midges, nymphs maybe some early bwo's.
aslo, the green river in utah, below flaming gorge would be a good choice for fly fishing.
check in with us in about 10 months and we'll have the poop for you.