I was recently doing a batch of beer and for some reason the temp of the beer after I put it in the primary fermentation bucket wasn't low enough to pinch the yeast right away. I left the top off of the bucket a little bit to try and cool it faster but it was "exposed" for probably about an hour at least. My question is will this mess up the beer? or should it be ok.

  • My first all-grain batch (without a wort-chiller) took about 5 hours to cool sufficiently... I kept the lid on, pitched 5 hours later and it was fine. I built a wort chiller after that ;)
    – Philippe
    Commented Apr 30, 2020 at 19:33

2 Answers 2


Most likely it will turn out just fine, but you did add risk of infection keeping the lid off for a while. In future you should keep the lid on it, just to keep any wild organisms from flying into the beer and causing infection. I myself will often brew in the evening then let the beer cool overnight, with the LID ON, then pitch the yeast the next morning, with very good results and no infections.


I imagine there’s less air-born wild yeast spores indoors in the winter, so contamination is less likely, but resist opening lids. At end-of-boil all is sterile, so I put a weight on the lid, let it cool overnight and pitch in the kettle the next morning. Keepin’ it simple.

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