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We determine cluster mass fraction
f
c
(
r
,
t
) at position
r
within, and time
t
after firing, a pulsed supersonic gas jet by measuring femtosecond evolution of the jet's refractive index by single-shot frequency domain holography. A fs pump pulse singly ionizes monomers, while quasi-statically ionizing and heating clusters to a level at which recombination remains negligible as clusters expand. Under these conditions, index evolves in two simple steps corresponding to monomer and cluster contributions, allowing recovery of
f
c
without detailed cluster dynamic modeling. Variations of
f
c
with
t
are measured.