Streams can provide substantial energy subsidies to terrestrial ecosystems in the form of emergent aquatic insects. Because subsidy fluxes between streams and surrounding ecosystems are asynchronous, terrestrial predators often rely on adult stream insects as prey during periods with low terrestrial arthropod abundance, particularly in winter and early spring. However, most of what is understood about stream-to-terrestrial subsidies is from perennial systems. We quantified seasonal emergence patterns of Ephemeroptera, Plecoptera, and Trichoptera (EPT) from two zero-order non-perennial streams in the Ozark Highlands, a topographically complex karst region of the central USA. Fish colonize one of the streams during floods, and the other stream remains fishless. We collected emergent EPT during six 2-week periods spanning four key non-perennial stream seasons in this system in 2024-2025: rewetting (Nov), full-flow (Feb, April, June), pooling (July), and dry (Sept). Along comparable ~100-m reaches for each stream, we deployed 6 pyramidal emergence traps in the stream channel, as well as 6 Malaise traps placed lateral to the channel to estimate abundance and species richness of emergent EPT undertaking lateral flight. Including both streams, we have thus far documented 14 Plecoptera species, 11 Trichoptera species, and an estimated 8 Ephemeroptera species (mayflies are still being processed). Abundance of emergent EPT increased through the full-flow season, with peak emergence in June. Throughout the study, 64% of total captured EPT abundance across both trap types (~2,300 individuals) were collected by the 12 total Malaise traps. Of these, 487 winter stoneflies representing 4 species (Allocapnia jeanae, A. rickeri, A. mohri, Zealeuctra warreni) were captured early in the full-flow season (Feb). Interestingly, the stream with fish produced >2X more total EPT individuals than the fishless stream through the project duration. These numbers were largely driven by mayflies that are likely adapted to withstand fish predation through life-history responses such as increased development rates. However, the fishless stream had greater richness (25 species) than the fish stream (23 species). These findings show that very small non-perennial streams provide abundant and seasonally critical subsidies to neighboring terrestrial ecosystems, stressing the need for conservation management of these heretofore vastly underappreciated systems.