You can usually find shaded picnic areas without a reservation.

Yes, in most parks. Public picnic tables under trees or in open shelters are generally first-come, first-served. The tables you have to reserve are usually the big pavilions with electric hookups and room for 50 people.

Look for the smaller, scattered tables near the woods or playgrounds. Those are almost always free to use unless a park has some weird rule. If you’re worried, check the park’s website for a map — they usually mark reservable shelters separately.

Worst case, bring a blanket and find a shady tree. That works just as well.