This study describes trajectories of early literacy skill development of 99 children (n = 55 boys) in their first year of primary school in New Zealand (NZ). Children were assessed twice weekly for 8 weeks on Dynamic Indicators of Basic Early Literacy Skills (DIBELS; Good & Kaminski, 2011) First Sound Fluency (FSF) and AIMSweb Letter Sound Fluency (LSF; Shinn & Shinn, 2002), with other early literacy and beginning reading skills assessed before and after progress monitoring. FSF and LSF growth trajectories were modeled separately. Multilevel modeling indicated improved performance; however, growth mixture modeling indicated 3 growth trajectories (i.e., latent classes; FSF and LSF, respectively): typical (77.6% of children, 65.7%), developing (10.8%, 14.6%), and limited progress (11.6%, 19.7%). Beginning of year screening was sometimes associated with latent class membership, whereas latent class membership differentiated mid- and year-end literacy skills. Results support progress monitoring of early literacy skills within the NZ context to aid earlier identification of children at-risk for difficulties with reading acquisition. (PsycInfo Database Record (c) 2020 APA, all rights reserved).