You don't necessarily have to wait until spring. You can take the yeast straight from some fruit without having to leave the wort open to the air. Not sure yet if this will result in good yeast or not. I just tried it with cherries from our back yard. I did my usual technique; starter with 50% grapefruit juice. Poured this into six jars and dropped a cherry into each. 5 of them look foul. 1 of them, however, formed a nice krauesen and looked like a normal fermentation. It's still early on, but I'll see what this results in.
Anyway, point being, even if it's warm, you can try again using fruit to innoculate. I can't say if it will give good results or not this early on, however.