Jakobidult takes place in late July and early August (beginning on the Saturday after the feast day of St. James) and Kirchweihdult occurs round the middle of October, from Saturday prior to Kirchweih till the following Sunday.
The timing of Jakobidult coincides with the end of summer, typically between July 29th and August 12th, whereas Kirchweihdult occurs roughly two months later, from the Saturday before Kirchweih to the following Sunday.