Hail hit my roof. Do I need to replace it?
Yes
The granules (they're typically ceramic) act as UV protection and fire retardant. It's normal to lose these over time, but the shingle in your bottom picture looks to be missing as much as half its granules. Additionally, the larger the hail stone, the more likely it damaged the shingles themselves (1&quot; hail stones are serious).
Most homeowners insurance will cover this type of damage, meaning you pay the deductible and get a new roof. The key here is I would not wait long to at least explore a claim on this, lest you be unable to prove it was hail that did the deed. This is one of those lesser known (and hard to notice) ways your roof can be seriously damaged. I would get at least two roofing companies out to examine it and verify the damage.