From 2020, the New Zealand technology curriculum includes computational thinking. The new curriculum content is being introduced to students from 5 years' old. In preparation for its introduction, online resources have been developed for teachers (including junior teachers who teach new entrants, up to Year 3), that contain progress outcomes, lesson plans, exemplars, and assessments. However, it's not clear whether New Zealand junior teachers are sufficiently prepared to teach computational thinking and what factors influence their preparedness to teach the new curriculum. This research explored the experience of a small group of junior school teachers in the year before the technology curriculum was officially introduced. Research findings highlight that factors (including professional development, assessment, schoolwide support, and time availability) influence the uptake of the computational thinking curriculum by teachers in New Zealand junior classrooms.