October probably isn't the favorite month for many investors. Some of the market's biggest crashes in history occurred during the month. While the average return for the S&P 500 in October has been positive, the major index fell more than 2% last month.

There were nonetheless some big winners. Here are the three best-performing stocks in the S&P 500 in October -- and whether or not they're still good picks to buy.

Investors were in good hands with Allstate (NYSE: ALL) last month. The insurance stock soared 15% -- almost enough to wipe out the previous year-to-date decline.

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Source Fool.com