In his time playing college football for Alburn University Evans had a total of 149 carries for 626 yards and 6 touchdowns rushing and also had 30 receptions for 354 yards and 1 touchdown receiving. Mostly used as a lead blocker he played in 28 games and started 16.
In 2001 the Seattle Seahawks drafted Heath Evans in the third round of the 2001 NFL Draft. He played fullback for the Seahawks between 2000 and 2004. In those four years he appeared in 61 games. Mostly used as a blocker for Pro Bowl running back Shaun Alexander, in his playing time with Settle, Heath only had a total 33 rushing attempts for 108 yards (3.2 average per run) in his four years there. He also had 12 receptions for 87 yards.
After becoming a free agent in 2005, Evans signed with the Miami Dolphins and played six games with them before being surprising cut from of roster in the last week of October. Less than a week later, on November 1, 2005 the New England Patriots signed him to a contract. The week after signing with the Patriots, Evans was forced in to being the main running back for New England vs his old team the Miami Dolphins due to injury suffered early in the game by starting running back Corey Dillion. Evans made the Dolphins wish that they had held on to him for at least another week. In the game he ran for 84 yards on 17 carries and also caught 3 passes for 18 yards. He also scored a two-point conversion on a rushing attempt that put New England seven points ahead with less than two minutes left in the game. He ended up playing in five games for the Patriots in 2005 and in total had 52 rushing attempts for 192 yards (3.7 avg) plus 14 receptions for 105 yards.
In 2006 Heath played in all sixteen of the Patriots regular season games and had 117 rushing yards on 27 attempts (4.3 avg). He also scored his first NFL touchdown vs the Miami Dolphins in week five on a one-yard reception (he had 7 total receptions for 34 yards in 2006). His greatest value as a player though was opening up holes for New England running backs to run through all season. In the 2006 postseason AFC Championship game vs the Indianapolis Colts he had 3 receptions for 33 yards.
On February 24, 2007, Heath resigned with the Patriots to a two-year contract. In the Patriots four preseason games, Evans scored four touchdowns, three rushing and one receiving. in the Patriots regular season opener vs the New York Jets, Evans scored his first career NFL rushing touchdown on a one-yard plunge into the endzone.