I would not worry about it getting too hot until beyond mid-late May in the Moab area. Several trips in late April through early May have the highest temps in the mid 80s or so in the canyon like areas and it still gets into the 40's at night. March will still be on the cool side for my likes, especially in the mornings.
The book "Guide to Moab, UT Backroads & 4-Wheel Drive Trails" by Charles A. Wells is an excellent guide to the Moab area if you do not have anyone with local experience around, sometimes even with :-). There is an ATV version of the book also, I found the 4WD book most useful for DS riding though.
K7MDL screwed with this post 01-27-2013 at 02:23 PM