On the centenary of Cajori's birth, in 1959, Colorado College sponsored a public lecture in his honour and memory. This was given on 25th February 1959 by the distinguished Norwegian mathematician and historian of mathematics Oystein Ore. (It was on 'Pascal and the invention of probability theory', and didn't mention Cajori once.) The next year another Cajori lecture was delivered, on April 21st 1960, this time by one of Cajori's former students, Harold Davis of Northwestern University. Davis gave rather fuller attention to Cajori for the first part of his lecture, with several reminiscences. The local newspaper the Gazette Telegraph reported this occasion as "the annual Cajori lecture", but it has not been possible to trace any subsequent one; it seems that there was an annual Cajori lecture, but for only the two years 1959 and 1960.

In 1986, the Mathematics Department instituted a Cajori Prize as an award, usually given annually, for outstanding achievement in mathematics. A plaque hanging in the mathematics lounge records the names of those earning this distinction. Once computer science grew to the point where it was drawing a substantial number of students, the Cajori Prize was expanded to include outstanding achievement in computer science as well.

On March 1st 1999 (the day after the 140th anniversary of his birth) the Mathematics Department laid on a 140th birthday tea for Florian Cajori, at which Fulbright Scholar and Visiting Professor of Mathematics John Fauvel (Open University, UK) gave an address entitled 'Florian Cajori and the Golden Age of Colorado College'.

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