Question about spring bulbs

I live in Columbus, OH. I buried some spring bulbs (daffodil, iris, crocus etc.) around mid Oct.and covered with falling leaves. But several days ago, I found some bulbs already begun to grow with leaves coming out from the soil. Will these bulbs die in the winter? Did I plant these bulbs too early? When is the most suitable time to bury spring bulbs in my area?
Thanks.
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Fooled ya, eh?
Some spring bulbs naturally produce their foliage in the late autumn. Its normal for them and the leaves typically suffer no damage from winter cold.

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Thanks a lot. It's my first time to grow bulbs so I don't know this kind of stuff. Is there anything I can do to protect them for the frozen weather in winter?

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They don't need any protection. They have been doing it for millions of years in the wild without protection. They are well adapted to the cold.
There really should be a list of bulbs that produce their foliage in that autumn so that new growers don't panic every year when this happens.

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Cereus-validus. wrote:

I think this is a survival issue. The green tops come up as a marker in the fall to inform the wild gardener NOT to dig like mad to put new bulbs in THAT space.
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Yeah, except many of the ones that produce their foliage in the autumn tend to be rapid spreaders and weedy!!!
Its more likely its a strategy to dominate all the others in the immediate area by getting a very early head start.
You are right that many gardeners tend to over plant and they need a not so subtle reminder when to stop.

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