Siuslaw NF / Oregon Dunes

**Siuslaw NF / Oregon Dunes – Tier A Analysis** You're looking at a genuine Tier A window driven by sustained soil moisture (0.23 VWC holding steady) meeting the morel and oyster trigger simultaneously—both species are firing at peak conditions with soil locked at 54.7°F and seven days of consistent threshold performance. The moderate-tier species (Psilocybes, Banded Mottlegills, Stinkhorns) are technically viable but soil temp is just barely kissing minimums; they'll flush if we get another 48 hours of warmth, but don't count on it yet. The limiting factor here is desiccation risk—you've got 0.82" in the last week, which is solid, but the coastal exposure and dune environment mean this moisture window is closing. Once that 0.23 VWC drops, the whole operation shuts down fast. Watch the next 36 hours for any uptick in soil temperature (into the 56–58°F range)—that alone would pull the moderate species into high viability. If precip stays absent and temps rise, you're looking at a hard fade by early June. **Hot tip:** Work south-facing slopes and disturbed dune edges where oysters will flush earlier than morels; the thermal differential is your friend here, and you'll extend your window by 3–4 days on exposed ground versus shaded forest floor.

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.