What Grows in Hot Sulphur Springs, Colorado

The last hard freeze (28°F) in Hot Sulphur Springs typically lands around May 29, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about Jun 19.

The first hard freeze (28°F) in Hot Sulphur Springs typically arrives around Sep 17, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 3, so the watching starts about Aug 18 — about 111 days after the spring freeze cleared.

Measured between 28°F hard freezes, Hot Sulphur Springs sees about 111 frost-free days — roughly May 29 through Sep 17, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 19 to Sep 3, about 76 days.

The federal record around Hot Sulphur Springs is a meaningful one — 46 documented sites, mostly Underground Storage Tanks entries (37), the nearest Underground Storage Tanks record under a tenth of a mile out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.

With about 111 frost-free days between hard freezes, Hot Sulphur Springs rewards the classic extension moves: floating row cover buys roughly two to four extra weeks at each shoulder — on this season that is a working window nearer 139 to 167 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 29 hard-freeze normal stretches the season without touching the calendar.