National Oatmeal Muffin Day Image by Castorly Stock, via Pexels National Oatmeal Muffin Day celebrates the sweet taste of a delicious oatmeal muffin. National Oatmeal Muffin Day + Add to Google Calendar + iCal / Outlook export Date Dec 19 2025 Time All Day Local Time Timezone: America/New_York Date: Dec 19 2025 Time: All Day Category Holiday Share this event
