dndodd: According to Nasdaq pre-market trading starts at 4:00 A.M. Maybe you brokerage house has a restiction
Investors may trade in the Pre-Market (4:00-9:30 a.m. ET) and the After Hours Market (4:00-8:00 p.m. ET). Participation from Market Makers and ECNs is strictly voluntary and as a result, these sessions may offer less liquidity and inferior prices. Stock prices may also move more quickly in this environment. Investors who anticipate trading during these times are strongly advised to use limit orders.
* Data is delayed at least 15 minutes. Nasdaq.com will report pre-market and after hours trades. * Pre-Market trade data will be posted from 4:15 a.m. ET to 7:30 a.m. ET of the following day. * After Hours trades will be posted from 4:15 p.m. ET to 3:30 p.m. ET of the following day.