  We describe why Ising spin chains with competing interactions in $\rm
SrHo_2O_4$ segregate into ordered and disordered ensembles at low temperatures
($T$). Using elastic neutron scattering, magnetization, and specific heat
measurements, the two distinct spin chains are inferred to have N\'eel
($\uparrow\downarrow\uparrow\downarrow$) and double-N\'eel
($\uparrow\uparrow\downarrow\downarrow$) ground states respectively. Below
$T_\mathrm{N}=0.68(2)$~K, the N\'eel chains develop three dimensional (3D) long
range order (LRO), which arrests further thermal equilibration of the
double-N\'eel chains so they remain in a disordered incommensurate state for
$T$ below $T_\mathrm{S}= 0.52(2)$~K. $\rm SrHo_2O_4$ distills an important
feature of incommensurate low dimensional magnetism: kinetically trapped
topological defects in a quasi$-d-$dimensional spin system can preclude order
in $d+1$ dimensions.
