Severe temperatures during a fire have a significant impact on steel structures. As steel regains most of its strength post the fire exposure, structural elements can be reused if the structure has not collapsed during the fire. After heating and cooling, tensile coupon tests and stub-column compression tests at room temperature were used to evaluate the mechanical properties and buckling strength of cold formed steel (CFS) omega shaped stub columns. The tensile coupon test specimens were cut from a hot rolled pickled oiled (HRPO) steel sheet of grade E 250 and E 350 with 1.6 mm thickness. The coupons were heated inside an electric furnace till the target temperatures of 300 °C to 900 °C were reached and then the target temperature was maintained for 20 minutes for uniform temperature distribution. The compression capacities of omega shaped stub columns were experimentally evaluated after being exposed to elevated temperatures from 300 °C to 900°C. It was found out that following the heating and cooling procedures, the yield, tensile strength, and strength of CFS omega shaped stub columns dropped. The experimental results were used to validate a finite-element model in terms of failure mode and ultimate strength. Further parametric studies were carried out on different stub column specimens.