You will find Barron County to be a little more field running, but there is a fair amount of wooded trails as well. Some super fun rolling hills between wooded areas, and you can cover ground pretty quickly. Stops are plentiful for gas and food. Lodging may be a little less than some of the bigger northern counties, but there is some there. I own land in Barron County, but usually just ride to it, play in the woods, and get back to the trail. I usually base at my sisters south of New Richmond in St. Croix County, and Barron is a pass through county for me on a back pack trip. From just south of New Richmond, you can get to Spooner in just under 100 miles, or all the way to Winter WI in 140 miles.
As noted, snow can be a little more scarce from the Barron County area south, but the trails fun when they have the snow!