Lager yeast likes MUCHO colder temps, as proof, I used lager yeast in some pizza dough which was refrigerated for 48 hours and it worked like a champ...
Do you know what yeast you are using?
Lager can make a funky sulphur smell for the first phase of fermentation but that will go away... Ale yeast is mucho more sensitive to temps and will need 60+ for sure...
What makes you think that you messed it up? the smell?
You can always kick start the brew with more sugar/nutrient/yeast... How big of a batch do you have going???
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