The formation and development of Tržič are most closely connected with the path that led from the Gorenjska plain across the Ljubelj Pass to Carinthia. According to some archaeological finds it certainly existed in the historical era when it connected Virunum in Emperor's Field with Emona through Ljubelj. The settlement, then called Forum and Lubelino, which stood along this path, was destroyed by an avalanche and part of the population moved to the valley where the settlement of Neumarktl was established on the site of the present Tržič. The settlement began to develop at the foot of the castle hill, on which later stood the Neuhaus castle. Its development and shape were dictated by the traffic veins and the developing blacksmithing.
Some important and interesting years:
- 1261 - first mention of Ljubeljski Square (Forum in Lubelino)
- 1320 - first mention of Neumarktla (Tržič; Forum Novum)
- 1348 - severe earthquake
- 1383 - first mention of the parish of Tržič
- 1401 - Bistrica under the Castle Gutenberg (Fewstricz vnder Guttenberg) is mentioned
- 1463 - Ziga Lamberg, born at Gutenberg, becomes the first bishop of Ljubljana
- 1492 - Tržič obtains commercial rights granted by Frederick III
- 1557 - commencement of mining of mercury ore in the Senta mine
- 1689 - 80 houses on the left bank of the Bistrica burned by fire
- 1728 - in honor of Charles VI, the father of Maria Theresa, who travelled across Ljubelj, two pyramids are erected
- 1807 - Austrian Field Marshal Count Radetzky becomes owner of the Neuhaus estate
- 1811 - 150 houses and over 60 workshops on the right bank of Tržiška Bistrica burned in a large fire; 75 people died
- 1871 - Jakob Aljaž performs the song “Holy Night, Blessed Night” with the choir for the first time in Slovene language
- 1882 - Tržič School established
- 1901 - Tržič has public lighting and electricity
- 1904 - Tržič has water supply
- 1908 - Kranj - Tržič railway built
- 1919 - bourgeois school established
- 1926 - King Alexander I proclaim Tržič a city
- 1941 - occupation of Tržič
- 1945 - on May 12, Tržič was liberated - among the last places in Slovenia
- 1964 - the Tunnel of love officially opened
- 1966 - the last train from Tržič passes (January 15)