They may be South enough to not have issues but parts of N Colorado are getting hammered this winter. You might contact them or the biologist in that area and see how the deer are wintering.
Tons of snow in N Colorado and up into Wyoming.
We've got deer and pronghorn dyeing in droves right now all across the state, Wyoming I mean. The Snowies has tons of snow and over to Platte Valley and down into Colorado.
Ranch sounds nice for hunting, if deer are ok then you should have a nice hunt. I like the no atvs except for retrieval.
Make sure you have a decent pack frame for packing to the roads, just a frame with a meat shelf would be fine, no need for an expensive pack and frame combo.
Walden area is a neat spot and I've driven by the Spicer Ranches. Should be fun.
Be ready for travel delays, road closures and make sure your vehicle is prepared for snow driving, they have specific laws about 4 x 4 and snow tires during winter in Colorado.
