Much of the damage by the visitors was done by Washington, who scored 24 points as she hit 8-15 field goals. She made all of the treys for the Razorbacks as she nailed 7-11.
In contrast, the Tigers hit just 1-7 threes, and that proved to be the difference in the game along with a scoring drought at crunch time. After a basket by Whitney Boddie that put Auburn up 62-60 with 3:24 to play, Auburn didn't score the rest of the game.
DeWanna Bonner led the Tigers with 18 points and 11 rebounds. She hit 8-14 field goals and 2-3 foul shots.
Sophomore forward DeWanna Bonner produced a double-double for the Tigers.
Sherrell Hobbs, who sparked Auburn's first half surge, scored 15 points and added six rebounds. Boddie chipped in with 14 points and Trevesha Jackson scored 10 for the Tigers while adding a team-high 11 rebounds.
"I am just so disappointed we couldn't pull this out," Auburn coach Nell Fortner said. "We had some bad defensive breakdowns that led to open three-point shots. We just couldn't quite get a handle on Washington.
"I thought we had some poor decisions," the coach added. "I thought we had some poor decisions down at the end when we needed to get to the free line and we took jumpers instead, which is not what we were looking for."
Auburn out-rebounded Arkansas 45-38 and had 11 turnovers, two less than the visitors.
The Tigers fell to 1-2 in the SEC and 14-5 overall while Arkansas improved to 1-2 in the league and 14-5 overall.