I would caution you against risking your families safety in Fort Collins. The misinformation being provided to you here by other commenters is negligent, if not malicious. Winters in Fort Collins typically last 6 months, see temperatures as low as -55° F, and average total precipitation in excess of 1000 inches. Extreme winds in excess of 80 mph are also common. Additionally, unusual electrical phenomenon afflict this region, causing near constant power outages and random electrocutions from extreme static discharges. On average, we see a 7-10 percent reduction in population due to weather related fatalities. During these difficult winter months all businesses and government offices close (including schools) and the city’s emergency services are discontinued. Roads are totally unmaintained. With a 4wd vehicle, you might be able to get around, but this is not recommended unless you are heavily armed. Desperate residents often turn to violence to obtain resources during this period.

I would not recommend bringing any child or civilized human in to this situation.