Ratings
Despite falling ratings, CBS aired all Harper's Island episodes, although the show was moved from its original night and time to Saturdays. At the end of the 2008-2009 television season the show ranged at #50 being viewed in approximately 9,360,000 homes in North America.
In Australia, Harper's Island ratings were extremely underwhelming, being beaten by competing shows on other networks. After episode 2 was aired in Australia (episode 1 and 2 aired at 9:40pm), it was moved to a late night timeslot of 1:25am, episodes 9 and 10 were aired at the time of 11:20, episode 11 was aired at 2:15am, episode 12 and 13 were aired at 12:20. In Canada, the show continued to air on Thursday nights at 10 PM on GlobalTV. In Denmark, Harper's Island was moved after episode 5 from Thursdays 22:50 to around midnight. In Ireland the show stayed on its original Monday night airing time at 10:00 pm. In the United Kingdom, the show's ratings started off under average but as the series progressed it became the BBC Three channel's number one show on Sundays, and therefore maintained the 9pm slot. In Finland, the program was aired at 9:00 pm during the whole season. The series has been aired multiple times on Malaysia's RTM channel tv2, every Wednesday and Thursday nights airing at midnight.
| Episode # | US air date | Rating | Share | Rating/Share (18–49) | Viewers (millions) |
|---|---|---|---|---|---|
| 1 | Thursday, April 9, 2009 | 6.5 | 11 | 2.6/8 | 10.21 |
| 2 | Thursday, April 16, 2009 | 5.1 | 9 | 2.2/6 | 7.82 |
| 3 | Thursday, April 23, 2009 | 4.7 | 9 | 1.9/5 | 7.02 |
| 4 | Saturday, May 2, 2009 | 3.1 | 6 | 1.0/3 | 4.61 |
| 5 | Saturday, May 9, 2009 | 3.1 | 6 | 1.1/3 | 4.60 |
| 6 | Saturday, May 23, 2009 | 2.5 | 5 | 1.0/4 | 3.85 |
| 7 | Saturday, May 30, 2009 | 2.4 | 5 | 0.9/3 | 3.62 |
| 8 | Saturday, June 6, 2009 | 2.4 | 5 | 0.9/3 | 3.56 |
| 9 | Saturday, June 13, 2009 | 2.0 | 4 | 0.8/3 | 3.20 |
| 10 | Saturday, June 20, 2009 | TBA | TBA | 0.9/4 | 3.79 |
| 11 | Saturday, June 27, 2009 | 2.4 | 5 | 0.8/3 | 3.53 |
| 12 | Saturday, July 11, 2009 | 2.4 | 5 | 0.8/3 | 3.63 |
| 13 | Saturday, July 11, 2009 | 2.6 | 5 | 1.0/3 | 4.05 |
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