A few tips about visiting Grand Teton National Park in May: 1. It is a good month to see wildlife. The bears, males, females, and cubs are usually out and other animals including bison, moose, deer, and pronghorn have their babies in tow. 2. It is a good month for scenic drives. 3. The scenery is spectacular with snowy Tetons and a green valley floor. 4. If in-park services are important to you (restaurants, visitor centers, lodges, cabins) - arrive towards the third week of May when the service