Studying large samples of massive, passively evolving galaxies (called cosmic chronometers, CC) provides us with the unique ability to measure the Universe's expansion history without assuming a cosmological model. The Dark Energy Spectroscopic Instrument (DESI) DR1 is currently the largest, publicly available, homogeneous set of galaxies with reliable spectroscopic redshifts, and covers a wide range in redshift. We extracted all massive galaxies (stellar mass logM⋆/M⊙>10.75, and velocity dispersion σ>280
Nearby in the stack
km s
−1
), with no emission in [OII]
λ
3727
A˚
, with reliable redshifts as well as reliable D4000
n
measurements from DR1. From this sample of 360 000 massive, passive galaxies, we used D4000
n
and the method of cosmic chronometers to get three new direct, independent measurements of
H(z)=
88.48
±0.57(stat)±12.32(syst)
,
H(z)=
119.45
±6.39(stat)±16.64(syst)
, and
H(z)=108.28±10.07(stat)±15.08(syst)
kms−1Mpc−1
at
z=0.46
,
z=0.67
, and
z=0.83
, respectively. This sample, which covers
0.3<z<1.0
, is the largest CC sample to date, and we reach statistical uncertainties of 0.65
%
, 5.35
%
, and 9.30
%
on our three measurements. Our measurements show no significant tension with the
Planck
Λ
CDM cosmology. In our analysis, we also illustrate that even amongst samples of massive, passive galaxies, the effect of downsizing can clearly be seen.