There are several possible reasons why the eggs are hard to peel. They're too fresh. Super fresh eggs are notoriously hard to peel. If you have farm fresh eggs or backyard chickens, wait until the eggs are at least two weeks old before boiling those eggs. Not enough salt. Add a bit more salt to the boiling water next time. This helps the membrane separate from the shell as it cooks, resulting in easier peeling. They're cold. After cooking, peel the eggs while they're cool enough to handle still a bit warm on the inside. Once they've been fully chilled to a cold temperature in the ice bath, they'll be harder to peel.