Climate snapshot for alpacas
86/100Alpaca climate comfort score
65°FAverage high, Jul
10°FAverage low, Jan
~0Days above 90°F (32°C) per year
~244Frost nights per year
39 inAnnual precipitation
1Barber pole worm months
18Hay bales / alpaca / year
Main challenges
- Hard winters — average lows under 15 °F in Dec–Mar
Advantages
- Summers rarely reach heat-stress levels for alpacas
- Short or no barber pole worm transmission season
- Low meningeal worm risk
Overall rating: 86/100 — Excellent on our alpaca climate comfort score. Climate type: Mediterranean-influenced subarctic (Köppen Dsc).
Month-by-month climate
Average highAverage lowPrecipitation
| Month | High | Low | Precip. | Heat-stress index | Notes |
|---|---|---|---|---|---|
| Jan | 31°F | 10°F | 4.1 in | 105 · ok | frost |
| Feb | 33°F | 10°F | 4.1 in | 101 · ok | frost |
| Mar | 39°F | 14°F | 4.0 in | 110 · ok | frost |
| Apr | 44°F | 20°F | 3.6 in | 102 · ok | frost |
| May | 51°F | 29°F | 2.7 in | 104 · ok | frost |
| Jun | 61°F | 37°F | 1.1 in | 105 · ok | grass |
| Jul | 65°F | 42°F | 2.7 in | 113 · ok | worms, grass |
| Aug | 63°F | 41°F | 3.2 in | 117 · ok | grass |
| Sep | 57°F | 36°F | 3.1 in | 109 · ok | grass |
| Oct | 47°F | 27°F | 3.4 in | 99 · ok | frost |
| Nov | 38°F | 16°F | 3.5 in | 107 · ok | frost |
| Dec | 30°F | 10°F | 3.8 in | 98 · ok | frost |
Heat-stress index = average high (°F) + mean humidity (%). “Worms” marks months that suit barber pole worm transmission; “grass” marks the grazing season; “frost” marks months with average lows below freezing. Source: NOAA nClimDiv 1991–2020 county normals.
Alpaca care calendar for San Juan County, Colorado
January 31° / 10°F
- Hard cold: extra hay at night, heated water, windbreaks and coats for crias or seniors; check ears for frostbite.
- Vitamin D for crias and juveniles (ask your vet about product and dose).
- Toenail check and trim.
February 33° / 10°F
- Hard cold: extra hay at night, heated water, windbreaks and coats for crias or seniors; check ears for frostbite.
- Vitamin D for crias and juveniles (ask your vet about product and dose).
March 39° / 14°F
- Hard cold: extra hay at night, heated water, windbreaks and coats for crias or seniors; check ears for frostbite.
- Toenail check and trim.
April 44° / 20°F
- Book your shearer now — spring calendars fill up fast.
- Freezing nights: keep water open and feed extra hay during cold snaps.
May 51° / 29°F
- CDT boosters for females due next month; prepare a clean birthing paddock and birthing kit.
- Freezing nights: keep water open and feed extra hay during cold snaps.
- Toenail check and trim.
June 61° / 37°F
- Shearing month: shear the whole herd, and trim toenails, check teeth and body condition while animals are restrained.
- Run pre-season fecal egg counts so you know each animal's baseline.
- Cria season: check due dates daily, ensure crias nurse within 4 hours, dip navels and weigh crias daily for two weeks.
- Spring grass: switch from hay to pasture gradually over 1–2 weeks and monitor body condition.
July 65° / 42°F
- Barber pole worm season: fecal egg counts every 4–6 weeks, check eyelid color, pick up dung piles twice a week.
- Cria season: check due dates daily, ensure crias nurse within 4 hours, dip navels and weigh crias daily for two weeks.
- Breeding window for next year's crias (rebreed females 2–4 weeks after birthing).
- Toenail check and trim.
August 63° / 41°F
- Cria season: check due dates daily, ensure crias nurse within 4 hours, dip navels and weigh crias daily for two weeks.
- Breeding window for next year's crias (rebreed females 2–4 weeks after birthing).
September 57° / 36°F
- Breeding window for next year's crias (rebreed females 2–4 weeks after birthing).
- Secure winter hay: about 18 small square bales per alpaca per year here — test a sample before buying.
- Winter prep: install water heaters, repair shelters and windbreaks, stock bedding.
- Toenail check and trim.
October 47° / 27°F
- Freezing nights: keep water open and feed extra hay during cold snaps.
November 38° / 16°F
- Freezing nights: keep water open and feed extra hay during cold snaps.
- Vitamin D for crias and juveniles (ask your vet about product and dose).
- Toenail check and trim.
December 30° / 10°F
- Hard cold: extra hay at night, heated water, windbreaks and coats for crias or seniors; check ears for frostbite.
- Vitamin D for crias and juveniles (ask your vet about product and dose).
Key recommendations
- Shearing: June.
- Best months for crias to be born: Jun–Aug (breed in Jul–Sep).
- Heat precautions: rarely needed — still provide shade and water.
- Barber pole worm season: Jul — run fecal egg counts every 4–6 weeks in these months.
- Freezing nights: Oct–May — keep water from freezing.
- Vitamin D for crias: Nov–Feb.
- Grazing season: Jun–Sep (about 4 months); feed hay the rest of the year.
- Meningeal worm: Meningeal worm is uncommon this far west but cases occur near the edge of its range.
- Selenium: Most forage here supplies adequate selenium, and some western areas have high-selenium plants — avoid stacking selenium supplements.
Tools: heat-stress calculator · winter hay calculator · due-date calculator · parasite control guide.
Alpaca farms & shops nearby
No alpaca farms near San Juan County, Colorado are mapped on OpenStreetMap yet. If you keep alpacas here, consider adding your farm to OpenStreetMap — it will appear on this page after the next update.
Frequently asked questions
Can you raise alpacas in San Juan County, Colorado?
Yes. Alpacas are kept successfully in most climates with good management. San Juan County, Colorado scores 86/100 (excellent) on our alpaca climate comfort scale; the key issues are hard winters.
When should alpacas be shorn in San Juan County, Colorado?
Plan shearing for June, once nights stay above about 38°F (3°C) but before summer heat builds.
What is the best time for crias to be born in San Juan County, Colorado?
Mild months suit newborn crias best — here that is Jun–Aug. For births then, breed females in Jul–Sep (gestation is about 335 days).
How much hay does an alpaca need per year in San Juan County, Colorado?
With roughly 8 months of little or no grazing, plan on about 900 lb (408 kg) — around 18 small square bales — per adult alpaca per year, plus waste.
Nearby counties
Coordinates 37.781, -107.670 · land area 388 sq mi. Long-term averages, not forecasts. See methodology and data sources. Back to Colorado.