The booking window is only 3 months — but Memorial Day and July 31 open early
Iowa state-park campsites release on a rolling 3-month window (count back exactly 3 months from your arrival date). The exceptions catch people: arrivals on May 29, 30, and 31 all open March 1, and July 31 arrivals open May 1. Memorial Day weekend also carries a mandatory 3-night minimum stay, and you can't reserve within 2 days of arrival if you're paying by card. Stays are capped at 14 consecutive nights, after which you must vacate the park for at least 3 nights.
Source: Iowa DNR — Overnight Camping / Make a Reservation





