Need a hand?

Regular trading (open market) hours 

Regular trading hours are Monday to Friday 9:30am ET – 4pm ET, unless there's a market holiday.

You can still place market-on-open orders, which will be queued for market order execution on the next trading day. 

Limit and stop orders can be placed and queued at any time but will only be executed during market hours when the conditions of the order are met. Check this FAQ to learn more about order types.