Quote from stevegee58:
Actually hedging a credit spread is pretty straightforward.
Say you sold a put credit spread with a delta was 0.10. You're bullish to neutral on the underlying, as reflected in the positive delta.
Instead of the underlying cooperating and moving up or staying about the same, it starts moving down toward your short strike. As the underlying moves closer, your delta increases. As part of your trading plan you could have a rule that if the credit spread's delta gets around 0.25 you either bail or hedge.
To hedge, you'd just buy a put (long put = negative delta) for the same delta as the troubled credit spread. What about theta, you ask? You can buy a put that's the next month out from your credit spread so that the theta isn't as hot as the credit spread's.
So say you have a March credit spread that you opened with a delta of 0.10 and now it's 0.25 due to adverse movement of the underlying price. You could buy the April put that has a delta of -0.25 to neutralize the adverse delta of the credit spread.
When do you take off the hedge? When the credit spread's delta subsides due to the underlying moving back up would be one way. Maybe you could take if off when the credit spread's delta returns to 0.15 or 0.10 or whatever your analysis says is best. If your credit spread is totally overrun, you'd just leave the hedge put on.
Yes, this sort of thing costs money, but it sure beats having your whole credit spread overrun with no protection.