Viewers

The episode was viewed by 5.16 million people, earning a 1.5/5 in the 18-49 rating demographics on the Nielson ratings scale, marking a 5% decrease in viewership and ranking first in its timeslot and for the first time, ranking first for the night in the 18-49 demographics.^[1] This means that 1.5 percent of all households with televisions watched the episode, while 5 percent of all households watching television at that time watched it.

Critical reviews

"Let Your Hair Down" received positive reviews. Amy Ratcliffe of IGN gave the episode a "great" 8.0 out of 10 and wrote "This episode shows that the supernatural can be blended in with a soft touch. Holly was a Blutbad, sure, but more importantly she was a lost girl. She survived alone in the woods for years because of her wolf-ness; she was able to come back to reality because of connecting with Monroe. The fairy tale aspect was relevant to the story, but it didn't take center stage. The emotional and scary parts of her ordeal were able to shine through. It was an ideal mix."^[2]

The A.V. Club's Kevin McFarland gave the episode a "B−" grade and wrote, "Grimm has too many threads to follow right now, and it's painted itself into a corner where even a few great scenes that move the episodic plot along and tease out some details of the creature world leaves something out, and tonight that was the slow crawl of the season-long arc. There is very little narrative drive beyond a weekly case and some background information from Eddie Monroe. Once Upon A Time finds itself in a position where it's using flashbacks to serve a constant drive forward in an ongoing story, and not focusing as much on the episodic conflicts. Grimm is getting too bogged down in the Law & Order case-of-the-week and not providing enough in serialization. It's still in a state of flux, and doesn't quite know what it wants to be. I'm along for the ride, and any episode that features Silas Weir Mitchell in a bigger role can't be all bad, but 'Let Your Hair Down' is a warning sign that Grimm has too many plates in the air, and if it isn't careful, they're all going to come tumbling down and make a huge mess."^[3]

TV Overmind's Shilo Adams wrote, "When I took on the role of writing about Grimm, I was a tad nervous. I’m not a huge watcher of procedurals and very rarely watch cop dramas in my free time, so I simply hoped that the show would toss in enough serial elements to keep me interested to go along with the expected legal wranglings of Portland, Oregon. After a sluggish start in terms of character beats, it looks like Grimm is on its way to being able to please fans of the serial and procedural elements of TV, if 'Let Your Hair Down' is any indication. Grimm may not stack up character moments like its genre show peers, but when it does decide to give you a peek behind the curtain, it's usually a whole lot of fun, as evidenced by last night's episode that gave just about everybody a moment or two to just be themselves."^[4]

Nick McHatton from TV Fanatic, gave a 4.2 star rating out of 5, stating: "Over the last two episodes, Grimm has found a storytelling pace that really works, and it's beginning to offer payoffs to plot elements laid out weeks ago. Now if only I can figure out if Juliette is an evil-doer and Renard would actually do something fairy tale-ish."^[5]