Re: July trip to NM & CO becomes June trip
Sorry to hear about your health issues. I'll be wishing you the best.
The rivers should be just as good in June as July. Runoff will be low this year thanks to the miserably low snowpack. You shouldn't have a problem wading or fishing any river in that region.
If you were planning on fishing the Costilla in the Valle Vidal, many areas will be closed until July. So that is really the only impact of you changed plans I'd expect.
Good luck and take care!