Wikipedia
- Open-content encyclopedia article covering the history of the holiday.
- http://en.wikipedia.org/wiki/Groundhog_Day

Groundhog Day-NOBLE
- Collection of Groundhog Day links from NOBLE: the North of Boston Library Exchange.
- http://www.noblenet.org/year/groundhog.htm

Wiarton Willie and Groundhog Day
- Includes reports, quick facts, and related links.
- http://www.cbc.ca/news/background/groundhogday/

Groundhog Day
- Background of Groundhog day along with trivia, songs, and groundhog wallpaper.
- http://groundhog-day.123holiday.net/

About.com: What the Heck is Groundhog Day Anyway?
- Includes a brief history of Groundhog Day and links to famous groundhogs, plus photos, FAQ, and event listings for the celebration in Punxsutawney, Pennsylvania.
- http://pittsburgh.about.com/library/weekly/aa012501a.htm

Groundhog Day in Wiarton
- Short description of the holiday, along with the latest weather information from the home of Wiarton Willie.
- http://www.teledyn.com/fun/GroundhogDay/

Groundhog Day and Chinese Astronomy
- Explanation of relationship between Groundhog Day and Chinese Astronomy.
- http://www.friesian.com/grndhog.htm

Reasons to Celebrate Groundhog Day
- Humorous top 10 list.
- http://ourworld.cs.com/DonaldRHalley/groundhg.htm

Frumious Bandersnatch Satirical Newspaper and Ezine
- "Groundhog buried alive; Phoenix faces 12 years of summer!" Satire about Punxsutawney Phil.
- http://www.bandersnatch.com/bander4.htm

Wiarton Willie
- Home page of Canadian weather groundhog, Wiarton Willie.
- http://www.wiarton-willie.org/index.cfm

Groundhogs at HogHaven
- Groundhog photographs, sounds, animation, information, postcards, and screen saver.
- http://www.hoghaven.com/

Groundhog Day History
- Groundhog Day history from Stormfax, with folklore and winter weather lore.
- http://www.stormfax.com/ghogday.htm

PunxsutawneyPhil.com
- A tribute site to the world's most famous weather-forecasting groundhog.
- http://www.punxsutawneyphil.com/

Groundhog.Org
- Official site of the Punxsutawney, Pennsylvania, Groundhog Club. Includes detailed history of the day, a listing of local events, and printable activity pages for kids.
- http://www.groundhog.org/