The earliest traces of human settlement are several La Tène era graves to the east of Langdorf.

The Roman road from Oberwinterthur (Vitudurum) to Pfyn ran through what is now the Allmend in Frauenfeld.

In the 13th century, Erching formed a self-contained manor farm complex and was occupied by a Habsburg Vogt after 1270.

[4] By the end of the 1220s, a fortified tower with a mill and chapel was built and a third village began to grow up around the castle.

This village, which would become Frauenfeld, grew gradually on land owned by Reichenau Abbey.

It is therefore uncertain whether the city was founded by the Kyburgs really with the tacit approval of Reichenau, as was earlier believed.

It is also conceivable that the castle and maybe a smaller surrounding village was built by a third party, perhaps a Toggenburg, of Murkart or Hagenbuch noble.

If that was the case, as they lost influence in the 1220s in the lower Murgtal, the Kyburgs and later the Habsburgs expanded into the region and gained control of Reichenau's rights and castle.

In 1374, the Habsburgs bestowed the right of judgment for all of Thurgau (which then included St. Gallen) on the Duke of Frauenfeld.

After 1442 it temporarily fell back under Austrian control, then in 1460, the Thurgau (including Frauenfeld) was captured by the Swiss Confederation.

The wooden houses were clustered around the two longitudinal and three cross streets, but a town square or other large, open space was missing.

The so-called Gachnanger Stock was in the northeast and the Spiegelhof with Holdertor (city gate) were in the southeast corner.

Catholic membership in the town council never fell below 33% and the two denominations alternated appointing mayors.

For church affairs ever existed a Protestant and a Catholic Grand and Lesser Councils, which supervised the two schools in the city.

Starting in 1712, the gathering of Swiss Eidgenossen took place alternately in Frauenfeld and Baden.

The fall of the old Old Swiss Confederacy in 1798 as a result of the French invasion brought an end to the gatherings in Frauenfeld.

Following the French invasion of the Confederation, Thurgau was created as a full canton in the Helvetic Republic.

Both the cities of Winterthur and Constance were considered, but the main alternative to Frauenfeld was Weinfelden.

While Frauenfeld was near the border with Zürich, Weinfelden is located in the geographic center of the canton.

Between 1813 and 1816, Bernhard Greuter, who had established a branch factory of the Islikoner Textilfärberei (Islikon textile dyeing factory) in Frauenfeld in 1805, had the moat filled in and created the promenade - a symbol of the establishment of a bourgeois public place in town.

[6] In 1919, the municipalities of Langdorf, Kurzdorf, Huben, Herten, and Horgenbach became part of Frauenfeld.

It consists of the town of Frauenfeld (made up of the old city, Ergaten-Vorstadt to the west and Obere Vorstadt to the east) and the former communities of Langdorf, Kurzdorf, Huben, Herten, Horgenbach, Gerlikon, Zelgli and Schönenhof.

[9] The age distribution, as of 2009[update], in Frauenfeld is; 2,135 children or 9.3% of the population are between 0 and 9 years old and 2,488 teenagers or 10.9% are between 10 and 19.

[16] The historical population is given in the following table:[5] There are ten buildings that are listed as Swiss heritage site of national significance in Frauenfeld.

The entire old city of Frauenfeld is included in the Inventory of Swiss Heritage Sites.

The wettest month is June during which time Frauenfeld receives an average of 127 mm (5.0 in) of rain or snow.

[22] Frauenfeld is a central location in western Thurgau and is served by a railway station and two exits on the A7 motorway.

Frauenfeld railway station supports a regional train, part of the Zürich S-Bahn, from Weinfelden to Winterthur (S8 and S30) every 30 minutes, as well in the opposite direction and a fast train (InterCity and InterRegio) that travels to Zürich every 30 minutes, as well in the opposite direction to Weinfelden and further to Constance in Germany or Romanshorn.

Frauenfeld is also the northern terminus of the narrow-gauge Frauenfeld–Wil line; trains operate from the Bahnhofplatz in front of the main railway station.

[23] Services on this line, designated as S15 of the St. Gallen S-Bahn, also stop at Frauenfeld Marktplatz and Lüdem.