Archeological sources[1][2][3] confirm human habitation during Paleolithic, Neolithic and Mesolithic Ages.

Later the region came under Cholas, Pallavas, Gangas, Nulambas, Hoysalas, Vijaya Nagar and Bijapur emperors, Wodeyars of Mysore and Nayaks of Madurai.

The majestic fortress, built on Krishnagiri hill by the Vijaya Nagar emperors, stands as testimony still now.

During Mysore war I, the British troops passed through Krishnagiri to attack Hyder Ali's Forces at Kaveripattinam.

In Mysore war II after the "Treaty of Srirangapattinam" entire region of Salem and Barah Mahal were surrendered to the British.

Under the diplomacy of Robert Clive, the then Governor of Madras Presidency, Krishnagiri became the headquarters of Bara Mahal.

The historical importance and potential growth in education, economy and tourism of present Krishnagiri made it necessary to create a separate district.

Winters are generally very warm but dry, although the morning temperature can fall to 13 °C or 55.4 °F, and clearly the best time to visit.

Telugu and Kannada are also spoken here, due to the proximity towards Andhra Pradesh and Karnataka states.

REST Society for Research International which conducts various conference and seminars is also registered in Krishnagiri.

Krishnagiri is an urbanized city well connected between AP, Karnataka and Tamil Nadu by NH7 (National Highway 7).

Krishnagiri connects 3 different states i.e. Tamil Nadu, Karnataka and Andhra Pradesh.

[11][12] The new bus stand on the outskirts of the town is well connected by government buses and private carriers to Chennai, Bengaluru, Coimbatore and other major cities and towns in Tamil Nadu, Karnataka, Andhra Pradesh, Kerala and Puducherry.

As per new budget report, the proposed new line would take off from Jolarpet Junction, Tirupattur and pass through Kandili, Bargur, Krishnagiri and Shoolagiri a length of 104 km to join at Rayakottai.

The museum in this District is known for traditional culture, art and architecture, heritage and historical background is a blessing in disguise, to spread the traditional and heritage, culture and art of Tamil Nadu and Krishnagiri District in particular.

This museum collects the monuments, classifies and preserves them to conduct research on their historical worthiness.

The Krishnagiri Mountain is famous for its well preserved fortress of Vijayanagar emperors, which later came under the rule of British empire.