Climate snapshot for alpacas
95/100Alpaca climate comfort score
75°FAverage high, Jul
15°FAverage low, Dec
~0Days above 90°F (32°C) per year
~219Frost nights per year
24 inAnnual precipitation
1Barber pole worm months
17Hay bales / alpaca / year
Main challenges
- Hard winters — average lows under 15 °F in Dec
Advantages
- Summers rarely reach heat-stress levels for alpacas
- Short or no barber pole worm transmission season
- Low meningeal worm risk
Overall rating: 95/100 — Excellent on our alpaca climate comfort score. Climate type: Warm-summer humid continental (Köppen Dfb).
Month-by-month climate
Average highAverage lowPrecipitation
| Month | High | Low | Precip. | Heat-stress index | Notes |
|---|---|---|---|---|---|
| Jan | 31°F | 16°F | 2.0 in | 91 · ok | frost |
| Feb | 33°F | 15°F | 1.9 in | 101 · ok | frost |
| Mar | 42°F | 21°F | 2.0 in | 103 · ok | frost |
| Apr | 48°F | 26°F | 2.3 in | 99 · ok | frost |
| May | 57°F | 33°F | 2.7 in | 113 · ok | grass |
| Jun | 64°F | 39°F | 2.9 in | 116 · ok | worms, grass |
| Jul | 75°F | 45°F | 1.2 in | 117 · ok | grass |
| Aug | 74°F | 44°F | 1.1 in | 122 · ok | grass |
| Sep | 64°F | 38°F | 1.5 in | 111 · ok | grass |
| Oct | 49°F | 29°F | 1.9 in | 93 · ok | frost |
| Nov | 36°F | 20°F | 2.1 in | 97 · ok | frost |
| Dec | 29°F | 15°F | 2.1 in | 84 · 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 Granite County, Montana
January 31° / 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.
February 33° / 15°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).
March 42° / 21°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.
April 48° / 26°F
- Book your shearer now — spring calendars fill up fast.
- Freezing nights: keep water open and feed extra hay during cold snaps.
May 57° / 33°F
- Run pre-season fecal egg counts so you know each animal's baseline.
- CDT boosters for females due next month; prepare a clean birthing paddock and birthing kit.
- Spring grass: switch from hay to pasture gradually over 1–2 weeks and monitor body condition.
- Toenail check and trim.
June 64° / 39°F
- Shearing month: shear the whole herd, and trim toenails, check teeth and body condition while animals are restrained.
- 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.
July 75° / 45°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).
- Fly season: clean dung piles regularly and use traps around the barn.
- Toenail check and trim.
August 74° / 44°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).
- Fly season: clean dung piles regularly and use traps around the barn.
September 64° / 38°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).
- Secure winter hay: about 17 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 49° / 29°F
- Breeding window for next year's crias (rebreed females 2–4 weeks after birthing).
- 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).
November 36° / 20°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 29° / 15°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–Sep (breed in Jul–Oct).
- Heat precautions: rarely needed — still provide shade and water.
- Barber pole worm season: Jun — run fecal egg counts every 4–6 weeks in these months.
- Freezing nights: Oct–Apr — keep water from freezing.
- Vitamin D for crias: Oct–Mar.
- Grazing season: May–Sep (about 5 months); feed hay the rest of the year.
- Meningeal worm: Meningeal worm is not established in this region.
- 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 Granite County, Montana 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 Granite County, Montana?
Yes. Alpacas are kept successfully in most climates with good management. Granite County, Montana scores 95/100 (excellent) on our alpaca climate comfort scale; the key issues are hard winters.
When should alpacas be shorn in Granite County, Montana?
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 Granite County, Montana?
Mild months suit newborn crias best — here that is Jun–Sep. For births then, breed females in Jul–Oct (gestation is about 335 days).
How much hay does an alpaca need per year in Granite County, Montana?
With roughly 7 months of little or no grazing, plan on about 833 lb (378 kg) — around 17 small square bales — per adult alpaca per year, plus waste.
Nearby counties
Coordinates 46.396, -113.427 · land area 1,727 sq mi. Long-term averages, not forecasts. See methodology and data sources. Back to Montana.