Umpqua NF / Diamond Lake

Umpqua/Diamond Lake grades Excellent because the moisture trigger is met and soil moisture is sustained at 0.20 VWC across the full 7-day window, with no drought and snowmelt complete. Oyster is the only species with all conditions fully met (45°F soil, 7/7 days above threshold). Matsutake, Wavy Cap, and the Psilocybe species (Allen's and Conifer) are also sitting right at their temperature floors with 7/7 days above, so they're viable but at the cold edge. Warmer-preference species like King Bolete, Chanterelle, Lobster, Cauliflower, Black Trumpet, and Banded Mottlegill are marginal at 45°F against 50-58°F minimums, so expect thin, slow flushes. Soil temperature is the real ceiling here, and the dry past week (0" in 7 days, 0.05" in 14) means moisture is held up by existing soil reserves rather than fresh rain. Watch for a cold snap pushing soil below 45°F, which would drop the cold-edge species first, and for a rain event, which would reinforce the moisture signal. Hot tip: Target Oyster and Matsutake first, focusing on lower-elevation, south-facing slopes and sun-exposed duff where soil runs warmest, and skip the heat-demanding species like Cauliflower and King Bolete unless you find a warm pocket.

Generated by Claude (Anthropic) from the structured weather, soil, and phenology data on this page. The LLM can misread edge cases — treat this as a starting hypothesis, not a guarantee. Always verify conditions on the ground before committing to a long drive.