The Parkway is open year round.  Some park sites, including Turkey Run Park, Theodore Roosevelt Island, Great Falls Park, etc., typically close at dark.  The Parkway itself remains open 24 hours a day to vehicle traffic.  For more information, contact the park at 703-289-2500.

The heaviest visitation is during the spring and fall months.  Winter months (November - March) have the lightest visitation.

Summers are generally hot and humid.  Carrying water is highly recommended during the warmer months, or while participating in physical activity.  Winters are generally cold with variable precipitation.  Layers of clothing are recommended, especially in Spring and Fall, and along the river.