Monarch migration is variable and population numbers and dates are different each year. The monarchs typically begin arriving in mid-October and leave by mid-February. At Natural Bridges, late October and all of November is often the best time to go for a walk and observe the monarchs. The Monarch Grove at Natural Bridges has been declared a Natural Preserve, thus protecting these butterflies and their winter habitat from human encroachment or harm. It is the only State Monarch Preserve in California.
On warm days, the butterflies fly all around you, giving you an ethereal experience. On cold days, the butterflies clump up in groups high in the trees, making for terrific photos. Bring binoculars, or a telephoto lens, and $10 for parking close to the entrance to the grove. Hold on to that receipt! Once you have paid for parking at one state park, you have paid for all state parks for the day, and there are over 14 in Santa Cruz County alone!