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Should downspout extenders be kept installed during winter? For some reason, I think they facilitate ice formation to creep up the spout?

When I say downspout extenders, I mean these

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    problem with those is that not all water drains out of the extenders which can then freeze – ratchet freak Oct 4 '14 at 14:55
  • How about finding a square and hard plastic version, which would ensure water would drain and then it would be okay? – TekiusFanatikus Oct 4 '14 at 15:29
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Proper drainage depends on a constant gradient. These flexible pipes don't provide that.

Those concentric corrugations and the flexibility that allows them to follow ground contour with a portion of the length dropping into a depression or having to go over an obstruction leaves a pool of water that freezes.

Elbows and rigid downspout stock to get the roof runoff out away from the foundation works best. There are fold-up metal/vinyl 48/60" extenders available that allow for flowerbed maintenance.

If you have a lot of winter precipitation as rain, or a lot of melt-water, you need to get the runoff out and away from the house foundation, which is the purpose of a proper downspout system. Thus, extending the outflow of the downspouts is needed year around to prevent this.

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