Groundhogs do not venture far from their hole - I've heard less than 50 yards from their den, so their browsing areas remains pretty much the same, and they can be seen again and again as long as there is food and no threat. Over the years, I've made a point of chasing down every single groundhog in my property. Most of the times they just run over or under the fence, sometimes they meet an unfortunate early end. However, they are bold and fond of the foods we grow, so they'll venture out when there is no human activity within the house. Trying traps right now, though nothing but some squirrels have fallen for that one so far. I may have to simple entrench the entire gardening area with an overly complicated fencing system that'll take a lot of hours of work and make gardening more difficult.