Summer months can be extremely hot and humid, with occasional severe thunderstorms. Fall and spring are pleasant with cool temperatures and brisk winds. Winter weather occasionally forces the closure of some park roads and buildings depending on severity. Sensible seasonal dress is recommended for your visit and depending on your planned activities, should include accessories such as sunscreen, hiking boots, and extra water.

The Visitor Center at Gettysburg National Military Park is a Federal facility. For the purpose of public safety, back packs, day packs, large handbags, packages, large containers and large parcels are not permitted in the building. All persons entering are subject to search. All purses are subject to inspection by Park Rangers on duty at all sites, including Eisenhower National Historic Site. It is to the visitor's benefit to leave such items locked in the trunk of their vehicle while visiting park buildings and we thank you in advance for your cooperation.

The possession of weapons is prohibited throughout the park.

Caution should be maintained while walking through tall grass and brush in natural and agricultural areas of the park. Lyme Disease can be transmitted to humans after contact with an infected deer tick, a smaller species of tick common in Pennsylvania. Visitors who prefer to walk in such areas should be aware of this danger and be certain to examine their clothing for these parasites. Poisonous plants and encounters with wildlife are not uncommon on the battlefield, and visitors should be aware of possible hazards while exploring the park on foot or by vehicle.