Flagstaff With Kids: A Four-Season Family Guide to Trains, Trails, and Snow Most Arizona family trips fight the heat. Flagstaff lets you skip it. Sitting at about 7,000 feet in the largest ponderosa pine forest in the country, this mountain town runs 20 to 30 degrees cooler than Phoenix in July, then turns into a genuine snow-play destination by December. That range is the whole point for parents: the same...