ABR, Inc.—Environmental Research & Services (ABR) worked with the National Park Service (NPS) to conduct an Ecological Land Survey (ELS) designed to classify and map soils and ecotypes (local-scale ecosystems) in Katmai National Park and Preserve (KATM). Field surveys were conducted during the summers of 2016 and 2017 to collect data for the range of ecological conditions present within KATM and to provide the data needed to map ecosystems and soils across the park. Herein, we present a tabulation of range extensions for 7 rare and 3 non-native plant taxa that we encountered as part of our field surveys in KATM. Specific rare and non-native plant surveys were not part of the scope of work for this project; however, one of the advantages of the ABR ELS approach to ecological inventory is that incidental observations of rare and non-native plants are recognized and reported. Rare taxa reported on include Carex echinata subsp. echinata, C. lapponica, C. phaeocephala, Draba aleutica, Eriophorum viridicarinatum, Limosella aquatica, and Primula tschuktschorum; and non-native taxa include Gnaphalium uliginosum, Phleum pratense, and Persicaria lapathifolium. A description of the environment and associated plant species, previous knowledge, and the significance of each observation are discussed for each taxon.