Yes, to get to Tanzania’s Mount Kilimanjaro, you will need a negative Covid-19 PCR test certificate is required when arriving the country. The PCR test needs to be taken within 72 hours of travelling to Tanzania. You will also be tested on arrival at a cost of $25), and need to complete this Traveller Survey 24 hours before you arrive at the airport in Tanzania.
You might also be required to have a negative Covid-19 test certificate when you depart Tanzania to return home. Here are updates on this requirement from the UK and USA.
Read more about COVID-19 and PCR tests in Tanzania