Hi Tracie, here is a suggestion from Panayoti Kelaidis:

I suspect your "pampas grass" may actually be Ravenna Grass (there are many thousands of the latter masquerading for every one of the true, South American Pampas Grass in Denver). But whichever you have, now is a great time to cut them back. I'd cut both stem and foliage back as far as new growth if you can. I warn you, wear sturdy gloves and long sleeves and possibly even goggles: the edges of all these tall grasses can be razor sharp, and make sure your pruning tools are sharp! If you leave the old stems and leaves, they look messy to most people's eyes through the summer season.