SoakDates

Natural hot springs live scattered across forum threads, personal blogs, and resort ads. This site is the other thing: a directory built from public records. Every spring here carries its recorded source temperature from the NCEI Thermal Springs List. Where the land manager's own material could be found, the spring carries that too — the agency, its rule or its access notes, the page linked, and the date we checked it. 42 springs currently clear the bar for public soaking; the rest are on the map for what they are.

No spring on this site is rated “safe.” Water changes with flow and season; the only reading that matters is the one you take at the edge of the pool.

Springs by state

• Colorado

  47 springs on record · 4 soakable

• Idaho

  232 springs on record · 7 soakable

• Montana

  61 springs on record · 0 soakable

• Wyoming

  132 springs on record · 3 soakable

• Utah

  116 springs on record · 0 soakable

• New Mexico

  77 springs on record · 5 soakable

• Nevada

  312 springs on record · 4 soakable

• California

  304 springs on record · 6 soakable

• Oregon

  126 springs on record · 6 soakable

• Washington

  30 springs on record · 1 soakable

• Arizona

  60 springs on record · 2 soakable

• Alaska

  108 springs on record · 4 soakable

Start with the ground rules

• How natural hot springs work

  Where the heat comes from, why source and pool temperatures differ, and what the temperature classes on this site mean.

• Soaking safety & etiquette

  Testing the water, the head-above-water rule and where it comes from, and how not to be the reason a spring gets closed.

• Developed, primitive, or resort

  What this site covers, what it deliberately doesn't, and how to tell which kind of spring you're looking at.