Read trailhead signs to learn etiquette of this trail.
Blue is best accessed from the Sunset West area, but you can also choose to park along Weld County Road 6 near the start. There's a nice new sign at the start informing users that this trail was just recently built and to follow all the trail etiquette rules.
Wind uphill from the start to the first junction and keep right to start the ascent up the easier track. Follow this as it makes nice easy switchbacks up to the top of the hill. There's a junction at the top which joins County Road 5, but stick to the farthest right path and you'll begin the second half of the loop down what the builders have deemed to be the "Blue Run".
There's not a ton of terrain here, but what is here has been well worked into the equation - including little micro gullies and undulating terrain.
The distance is on the shorter side, so some will turn around and do this twice.