I ran cross country for 1 year in high school, and my entire motivation was to get better for the hurdles. I worked on hurdles all summer, ran cross in the fall and as soon as cross finished, I was doing hurdles again in November. Cross gave me a great base to take into the track season. Moreover, it made me a lot stronger mentally. I finished 5th in the state that year and I hadn’t even qualified for state finals the year before. I also broke the school records in both hurdle races that year. Cross country helped me a lot and I would definately recommend it.
If you’re a high hurdler you’d probably be better off to not do XC. You’d be much better off doing pre-season hurdle work or even football. If you’re predominately a 400H than it may be of more benefit.