Frankfurt is 7 hours ahead of Chicago most of the year, and 6 hours from mid-March to late March and from late October to early November.
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Quick reference
| FRANKFURT | CHICAGO · MOST OF THE YEAR | CHICAGO · MID-MAR–LATE MAR, LATE OCT–EARLY NOV |
|---|---|---|
| 9:00 am | 2:00 am | 3:00 am |
| 12:00 pm | 5:00 am | 6:00 am |
| 3:00 pm | 8:00 am | 9:00 am |
| 6:00 pm | 11:00 am | 12:00 pm |
| 9:00 pm | 2:00 pm | 3:00 pm |
Questions
7 hours most of the year, and 6 hours from mid-March to late March and from late October to early November, when Frankfurt and Chicago change their clocks on different dates.
2am most of the year, and 3am from mid-March to late March and from late October to early November.
Yes, both, on different dates. Frankfurt moves to CEST (UTC+2) in late March and back to CET (UTC+1) in late October; Chicago moves to CDT (UTC-5) in mid-March and back to CST (UTC-6) in early November.