[2] The area of the future town belonged to a Cistercian Abbey from Koprzywnica, and by the mid 13th century, Jasło, known then as Jasiel or Jasiol, had a fair of local importance.

Together with a number of other locations in Lesser Poland, the village was granted Magdeburg rights by King Casimir III the Great, on April 23, 1366.

According to Dlugosz in Liber beneficiorum Dioecesis cracoviensis, the church that stands today was built by brothers Stanislaw Cielatko (Czelanthco), Sandomierz scholastic, and Mikolaj of Ciołek arms, in 1446.

[2] The coats of arms of Strzemie, Trąby, Gryf, Janina, and Pobóg are on the vault of the church, and because of this, the Slownik Geograficzny suggests these may be noble houses that contributed to the development.

The city was challenged at the start of the period; in 1474, the King of Hungary, Matthias Corvinus, burned Jasło in his assault of the foothills of the Carpathians.

[2] When referring the details of a 1564 city inspection, the Slownik Geograficzny described: "Judging by the number of bakers and cobblers, one must conclude that the town was significantly larger than today."

He revived the town and strengthened the prohibition against Jews, "because they hinder the townsmen in trade and buy up all the victuals," as described Strus, according to the Slownik Geograficzny.

In 1655, the town was captured and destroyed by the Swedes (see the Deluge), in 1657 – by the Transilvanians of George II Rakoczi, and in the first years of the 18th century - again by Swedish troops of King Charles XII of Sweden (see Great Northern War).

Several houses in the market square burned in the 1826 fire, which resulted in a construction boom, and in early 1846, farmers from villages around Jasło took part in the Galician peasant revolt.

The town was well-kept and clean, a power plant was built in 1897, then a municipal park was opened, and in September 1900, Jasło was visited by Emperor Franz Joseph of Austria.

[2] Around 1910, the priest Kisevsky and his six gendarmes persecuted Eastern Orthodox peasants by fining them on trivial pretexts, and many were taken to the court in Jasło to receive their sentences.

Prussian commander August von Mackensen moved his headquarters to Jasło the following morning, after the line was pushed back several miles beyond the city.

For most part of the interwar period, unemployment and poverty were prevalent, and the situation began slowly to improve in the late 1930s, after creation of the Central Industrial Region.

In 1937, Gamrat chemical plant was opened, but all efforts were destroyed in the German invasion of Poland, which started World War II in September 1939.

At the turn of 1939 and 1940, 93 Poles who tried to cross the border to find refuge in Hungary were imprisoned by the Germans in Jasło, and then massacred in the nearby village of Sieklówka (see Nazi crimes against the Polish nation).

[14] In September and October 1944, after the Soviet–German frontline was established, and remained unchanged for several months, the Germans began expulsion of all inhabitants of Jasło, as the town was located on the front line.

[16] Jasło is an important railroad junction of southeastern Poland, with trains going into three directions - eastwards (to Zagórz), westwards (to Stróże) and northeast, to Rzeszów.