Visiting the Monarch Preserve
Before you visit, you may want to call the park for current information on the population. Migration is variable and numbers and dates are different each year. The monarchs typically begin arriving in mid-October and leave by mid-February (In 2013 and 2016, the monarchs had left by January). At Natural Bridges, November is often the best time to for a walk to observe the monarchs. The Monarch Grove has been declared a Natural Preserve, thus protecting these butterflies and their winter habitat from human encroachment or harm. This is the only State Monarch Preserve in California.