Not a typical March in Wyoming

In northern Wyoming we’d still have snow usually, but this winter has been weird. We’ve had 3-5 days of summer then 3-5 days of winter, so I’m taking advantage of the great days as they appear. However, not putting in the proper miles indoors is seriously hurting me. My “flat” route today was 22 miles and still over 1000 feet of climbing. I need some fitness before heading above 9,000 feet in the mountains behind me.