We present a genome assembly from an individual male Trichopteryx carpinata (Early Tooth-striped; Arthropoda; Insecta; Lepidoptera; Geometridae). The assembly contains two haplotypes with total lengths of 477.01 megabases and 476.92 megabases. Most of haplotype 1 (98.05%) is scaffolded into 39 chromosomal pseudomolecules, including the Z sex chromosome. Haplotype 2 was assembled to scaffold level. The mitochondrial genome has also been assembled, with a length of 16.18 kilobases. Gene annotation of this assembly on Ensembl identified 12 506 protein-coding genes. This assembly was generated as part of the Darwin Tree of Life project, which produces genomes for eukaryotic species found in Britain and Ireland.