| Season | Premiere | Episodes | Notable |
|---|---|---|---|
| Season 1 | 2006 | 15 | Includes the separately dated pilot “The Rockies” |
| Season 2 | 2007 | 13 | — |
| Season 3 | 2008 | 12 | — |
| Season 4 | 2009 | 14 | — |
| Season 5 | 2010 | 7 | — |
| Season 6 | 2011 | 6 | — |
| Season 7 | 2011 | 6 | Final season; Reuters reported Discovery ended productions with Grylls in March 2012 |
Sources count regular episodes separately from specials where databases disagree. In-progress seasons show episodes aired as of October 22, 2026.