The trail continues after the shown end, and connects with Rocky Rd, but that section is not closed to bikes. Now the only real option is an out and back to the closed section.
Juniper is one of the better trails on the Framingham side, but suffers from a closure that turns it into a dead end. Mostly it's only useful as a connector between Deer Run
and Fox Hunt
Juniper leaves Deer Run
and heads north, intersecting with Fox Hunt
soon after. Juniper continues with good riding, but is a dead-end due to the closure.