Southern Utah in mid March can be a crap shoot.
In the past several years I have done some mid March trips into Canyonlands NP, Maze and Needles District, and had great weather. Last year we did a bike tour out of Grand Junction, CO around the first of April, heading down through the Paradox Valley and through Monticello UT, towards southern Utah. We encountered killer headwinds and got snowed out of the trip in Monticello and called for a ride home. It was too early that year!
I have a south rim Grand Canyon backpack trip in mid March this year. Hoping for good weather!!
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Gunnar Sport
Specialized Ruby
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Novara Randonee x2
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Jamis Dakar XCR