Is good afternoon capitalized?

Don’t capitalize good afternoon if you are using it as an informal salutation in an email with someone’s name (e.g. “Good afternoon, Paula.”)

You should capitalize it if it is part of a title or used as an email salutation without a name (e.g., “Good Afternoon!).

On a related note, what time is afternoon is sometimes a matter of individual perception. Someone on their way home from work at 5.30 p.m. when it’s dark outside might say “good evening” to an acquaintance they meet, for instance, while someone who is still at work at the same time, in the same town, might answer the phone with the greeting “good afternoon.”

QuillBot’s free Grammar Checker will help you to pick up capitalization errors with greetings such as “good afternoon.”