I haven't been up there for several years, but we used to catch trout in the North Platte River right in Torrington. Now is the right time to fish there. As soon as the irrigation season is over and the water clears up, you should be able to find some trout in there. Seems like we went to a city park that was right on the river there in Torrington.
Another place we used to go was Kelly Park at Guernsey. The best fishing was just after they shut down the irrigation for the season, but there should be trout there now too.
Good Luck and happy fishing!