Where would an asteroid have to hit earth to cause an impact winter?

I'm aiming for the fastest climate change possible without that much advanced notice, e.g. perhaps a regional sized asteroid scientists miss or are too distracted to catch on time?

Assuming the eastern part of the US would launch into deadly weather (cold not hot) conditions (but would allow survivors), where would this asteroid have to hit, what size would it be, and from the moment of impact, what would the breakdown be in layman's terms before the effects hit the eastern part of the US (aiming for NE)?

Bonus points for assuming the eastern part of the US is frozen, where survivors would aim to migrate for warmer/safer weather conditions.

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Where would an asteroid have to hit earth to cause an impact winter?

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