When to Shear Alpacas: A Climate Calendar

The wrong shearing date can kill an alpaca. Shear too early and a cold snap drops core body temperature below 35°C. Shear too late and a heat dome with morning rectal temperatures above 40°C does the same job from the other direction.

Most online guides hand you a calendar month and call it advice. "Shear in May" is fine for one farm in central England and dangerous for the same herd if it lives at 1,200 metres in South Tyrol. The right answer is the same everywhere - a temperature rule - but the date that rule lands on depends entirely on where you farm.

Here is the rule, the climate-indexed calendar, the edge cases that catch farmers out every year, and the husbandry checklist that turns shearing day into the single most useful 30 minutes per animal you will spend all year.

The Anchor Rule

Shear after nighttime lows reliably stay above 15°C (59°F), and before daytime highs sustain above 27°C (80°F) for several consecutive days.

That is the entire rule. Both thresholds matter, and most farmers only watch one of them.

The 27°C ceiling exists because alpacas do not shed. Their fleece - selectively bred for centuries to be denser and more insulative than any wild camelid coat - traps heat against the body. When ambient temperature climbs into the upper twenties, the animal can no longer dissipate metabolic heat through its thermal windows, the sparsely-haired ventral abdomen and medial thighs.

Heath et al. (2001) tracked eight male alpacas through Alabama summers and found that unshorn animals' morning rectal temperatures correlated with ambient temperature at r = 0.612 (P = 0.014). They ride the heat curve straight into hyperthermia. Shorn animals decoupled: their core temperatures stayed flat while ambient rose, and their medial-thigh surface temperatures sat 0.9°C cooler in the morning and 1.6°C cooler in the afternoon than the unshorn group.

The 15°C night-time floor exists because shearing strips the animal's primary defence against cold loss. A 2010 study from the Italian Apennines at 300 metres' altitude documented freshly-shorn alpacas dropping to morning rectal temperatures as low as 35.10°C when nights cooled too quickly. The animals showed no clinical signs of distress at that depressed temperature - alpacas have an unusually wide thermal-neutrality zone - but the margin to fatal hypothermia narrows fast at higher altitudes, and there is no benefit to operating closer to it than necessary.

Both thresholds in mind, the practical question becomes: when does my zone hit the safe transition window?

How Often Should You Shear an Alpaca?

Once a year, every year. Alpacas were selectively bred in the Andean highlands for fleece dense enough to keep them alive at 4,000 metres - and unlike sheep, they do not shed. Without a shearer, last year's fleece is still on the animal twelve months later, accumulating until thermoregulation fails.

Why not less. Skipping a year produces three predictable failures. The inner coat felts into a near-rigid mat that no comb or carder can salvage, and most processors refuse the fleece outright. Heat-stress mortality risk roughly doubles in the second summer - Heath et al. (2001) showed unshorn animals' core temperatures track ambient at r=0.612, and a 24-month coat amplifies that effect. And next year's shearer second-cuts every animal because no blade takes 24 months of growth in a single clean pass.

Why not more. Twice-yearly shearing is rare and almost always wrong. Processors want a 7–10 cm staple length; shearing twice a year produces 4–6 cm staples that are uneconomic to spin. The narrow exception is hot equatorial climates - parts of northern Australia, equatorial Africa - where some farms accept the fiber-value loss for a welfare buffer against year-round heat. For temperate and Mediterranean farms, one shear per year is correct.

The cost of skipping. A 5 kg single-year fleece worth €30–80/kg becomes a 9–10 kg matted, second-cut-prone fleece worth €5–15/kg next year - if any processor will take it.

The Climate Calendar

These windows are starting points. Always check your local 14-day forecast against the anchor rule before committing.

Subtropical and hot humid

Examples: US South, parts of northern Australia, North Italian lowlands. Window: February to early April.

Humidity dismantles what little evaporative cooling alpacas have. The heat-stress index climbs steeply in spring and you must be ahead of it. Book a shearer who can come early and pair shearing with strong barn ventilation in the weeks afterward.

Mediterranean

Examples: southern Italy, Iberia, southern France, coastal California. Window: mid-March to late April.

Last hard frosts are gone by early March; daytime highs cross 27°C reliably from mid-May. The Mediterranean window is short but predictable.

Cool temperate

Examples: UK, Ireland, north-western Europe, US Pacific Northwest, US Northeast, New Zealand South Island. Window: April to June.

This is the standard "spring shearing" zone most online guides write about. Watch the forecast: a late frost in May is more common than the calendar suggests. The Australian Alpaca Association recommends booking 12 months ahead in busy regions; in the US Northeast, contact a shearer by the end of February for a May or June slot.

Continental

Examples: US Midwest, Great Lakes, Eastern Europe, central Canada. Window: late April to June.

Humid summers arrive fast. Most Great Lakes breeders shear in April, May, or June and have the herd stripped before the first humid week.

Alpine and high-altitude

Examples: Swiss, Austrian and Italian Alps, Rocky Mountains, high Andes. Window: late May to late June.

Frost can occur in any month at altitude. Wait until nighttime lows have stabilised above 15°C for at least a week. After shearing, lightweight alpaca coats and a draft-free barn are not optional - the Italian Apennine data shows how quickly thermal inertia can drop a shorn alpaca's core temperature when the herd is denuded too early.

Southern Hemisphere

Examples: Australia, New Zealand, South America, South Africa. Window: September to March.

Mirror calendar. New Zealand's professional shearing season runs October through end of March; Australian timing varies by region but generally September to November. Coastal NSW operations sometimes start earlier where there is no frost risk. Booking lead time is the same: 6 to 12 months ahead in busy areas.

Booking: why winter is when you book

Professional alpaca shearers travel multi-farm regional routes to keep blades efficient and travel costs manageable. Most of them are booked solid by the time spring arrives. The Australian Alpaca Association and several US regional associations recommend confirming your shearer 6 to 12 months out, not 6 to 12 weeks. If you have a small herd, the cleanest move is to coordinate with neighbouring farms so the shearer can hit several properties on a single route - this is often the only way to secure a slot in popular regions.

If you missed the booking window: ask your local breeders' association for a shearer who covers your zone late in their route, and stay flexible on the exact day.

The Two-Week Pre-Shearing Checklist

14 days before: confirm the booking. Brush or use a livestock blower on the dirtiest fleeces to dislodge embedded vegetation, sand, and dust. Clean fleece extends blade life and lifts the commercial grade of the fiber.

7 days before: watch the forecast. If rain is likely, plan to shed the herd indoors the night before shearing day. Wet fleece is unprocessable, makes the animal dangerously slippery on the mat, and develops mould inside storage bags within hours.

1 to 2 months before: administer annual vaccinations (CD&T or your regional equivalent). Do this in advance, not on shearing day. The cortisol spike from restraint is immunosuppressive - vaccinating the same day blunts the antibody response. Take baseline body condition scores at the same visit; the dense fleece masks both emaciation and obesity until the animal is naked.

24 hours before: clean paddock, dry barn. Remove free-choice hay 12 hours before the appointment. A full rumen pressing against the diaphragm during lateral restraint causes acute respiratory distress and panic. Water restriction varies by shearer - ask. Most restrict water for 12 hours; none restrict longer.

Day Of: The 30-Minute Window

A professional shearer takes about 5 to 10 minutes per animal once the alpaca is on the mat. With prep, transition, and concurrent husbandry tasks, plan on 20 to 30 minutes per animal of focused work.

Restraint method matters. Wittek and Waiblinger at the University of Veterinary Medicine Vienna ran the definitive study in 2017, comparing standing restraint, lateral recumbency on a ground mattress, and an elevated tilt-table. Salivary cortisol - the gold-standard biomarker for acute distress - surged within 20 minutes of any restraint method, regardless of whether shearing actually occurred. The animals appeared calm to the eye; their blood chemistry told a different story.

The headline finding: standing restraint produced the lowest physiological stress for animals that stayed calm. But standing only works for genuinely docile alpacas, and the laceration risk if the animal bolts is high enough that most professional operations don't use it. Between the two practical alternatives, the soft ground mattress produced lower cortisol than the elevated tilt-table - vertical elevation amplifies the prey-animal panic response. Ask your shearer which method they use and why; both options are defensible, and the right answer depends on the animal.

Social buffering matters too. Alpacas are obligate herd animals. Keep herdmates within sight, sound, and smell of the animal being shorn. Never separate a nursing dam from her cria during the procedure. The Italian Società Nazionale Alpaca e Lama (SNAEL) is explicit on this point, and the cortisol data backs them up.

Shearing-Day Husbandry: Eight Things You Should Be Doing

Shearing day is the only day all year your animals are immobilised, naked, and observable inch by inch. Use it.

• Toenail trim. Flush with the soft pad, a little at a time. You can do this 3 to 4 times per year, but at minimum, today.
• Fighting teeth check. Males develop the six hooked fighting teeth at 3 to 4 years of age. One trim usually suffices for life, but inspect annually.
• Body condition score. 1-to-5 scale, palpate over the spine and ribs. Document the number - without the fleece, the animal's true condition is finally visible.
• Mid-side fiber sample. Small ziplock per animal, label with ID. Send for micron testing if you sell fiber commercially.
• Weight check. Set up a livestock scale next to the mat. The number is far more accurate than your monthly visual estimate.
• Microchip scan. Five seconds. Confirms identity for registry compliance and catches any chips that have lost signal or migrated.
• Record photo. Conformation is impossible to assess through a year's worth of fleece. Today is the only honest photograph you will take all year.
• Vaccination check (administered 1 to 2 months earlier, not today - see above).

Three-Bag Fiber Processing

If you intend to do anything with the fleece beyond composting it, organise the harvest as you go. Three labelled bags per animal:

• 1sts (blanket): the prime fiber from the body - finest, most uniform, lowest guard hair. 3 to 7 inch staple length. This is the high-value clip. Move it off the mat before the shearer starts on the legs and apron.
• 2nds: neck and upper legs. Slightly coarser, 1.5 to 5 inch staple. Acceptable for yarn, valuable for blends.
• 3rds: lower legs, apron, heavily contaminated trimmings. 1.5 inches and up, highest guard-hair content. Useful for felting and rug-making.

The catastrophic failure mode is letting blanket fleece sit on the mat while the shearer cuts the apron - coarse leg hair contaminates the prime clip and downgrades the entire blanket. For show-grade fleeces, lay paper sheets and "noodle" (carefully roll) the blanket intact to preserve staple architecture.

Edge Cases

Pregnant dams

Shear with the rest of the herd. Professional crews report well under 1% complication rates. The dam's risk profile flips in late gestation: a hyperthermic pregnancy in the final 60 to 90 days is materially more dangerous to both dam and fetus than the few minutes of restraint. The skilled shearer adapts handling for visibly pregnant females; the right call is almost never to skip them.

Crias and the maternal-bond rule

Wait at least 30 days post-birth before shearing a cria. Maternal scent recognition is established in the first weeks; a freshly-shorn cria can smell wrong to its dam, which has caused rejection on some farms. Do not shear the tail - that is the scent anchor the dam imprints on. Only shear during warm months, never before nighttime lows are stable above 15°C.

Yearlings (tuis)

Pallotti et al.'s 2020 randomised trial settled the long-running argument about first full shearing. Twenty Huacaya alpacas split into two groups: one shorn at exactly 10 months of age, the other left fleeced. Six months later, the shorn group had grown 7.71 cm of new fiber against 4.29 cm in the unshorn controls - +79.7% more growth, with no statistically significant difference in fiber diameter or secondary-to-primary follicle ratio. Early shearing does not cost you fineness; it actively stimulates follicular activity. Yearlings should be in the standard shearing rotation.

Geriatric or sick animals

Skilled shearers will adapt - softer surface, faster session, sometimes a recommendation to skip the day and rebook. But postponement carries its own heat-stress risk through the summer that follows. Talk to the shearer in advance; the right call is rarely "skip this year."

Two-year fleeces

Do not. Annual shearing is not an aesthetic preference - it is a welfare baseline. A two-year fleece risks matting (which causes clipper burn the following year because alpaca skin lacks lanolin), severe heat stress, and "second cuts" that destroy commercial value. The few farms that intentionally hold a fleece for two years for specific show or textile purposes use coats and air-conditioned barns through summer; this is not a default option.

Unscheduled rain

If the morning of shearing dawns wet - animals were not shed overnight - call the shearer. Wet fleece is the only true non-negotiable. Most professionals will rebook rather than risk a slip injury. If the shearer travels long distances, they may charge for the visit; this is fair, and far cheaper than an injured animal or a mouldy fleece harvest.

Post-Shearing Care

The first 72 hours after shearing are the riskiest of the year for two reasons most farmers do not expect.

Sunburn. Alpaca skin under fleece sees no sun for a year. Light-coloured animals - whites, fawns, light greys - are at real risk of sunburn for the first three to five days after shearing. Provide deep shade, and consider an animal-safe sunscreen on the ears and bridge of the nose for the lightest individuals.

Clipper burn. Alpaca skin has no lanolin. Even the cleanest shearing cuts can produce raw, weeping clipper burns, especially on animals whose fleece was matted or carried embedded vegetation. The wounds take up to two weeks to heal. Inspect each animal before they go back to the paddock and flag anything red or weeping for daily monitoring.

Other essentials. Fresh water with electrolytes. Avoid rough terrain or aggressive paddock-mates for the first 48 hours - a dominant herd member who tolerated yesterday's hierarchy may suddenly bully today's stranger-shaped animal. If your nights are still dipping near the 15°C floor, fit lightweight alpaca coats and shed the herd indoors overnight for the first week.

What to Write Down

Six fields per animal turn shearing day from chaos into a year of useful data:

1. Date sheared.
2. Body condition score (1 to 5).
3. Body weight (kg).
4. Total fleece weight (kg, blanket + seconds + thirds).
5. Mid-side micron sample - yes/no, and where you sent it.
6. Husbandry done today - toenails, teeth, vaccinations, photo, microchip.

That is exactly why we are building AlpacaKeep-an upcoming algorithmic early-warning system that tracks these exact metrics automatically.

While we finalize the platform, you don't have to keep guessing with the data. Join the AlpacaKeep Early Access Waiting List today and get immediate, free access to our ADG & Intervention Tracking Spreadsheet. Start securing your herd data now and be the first to gain access when the full software launches.

For a cleaner view of when next year's pregnancies will need cria watch in parallel with the next shearing season, we built a free gestation calculator - paste a mating date, get the safe window. The two annual rhythms (shearing and unpacking) usually overlap; planning them on the same calendar saves you the worst weekends.

Sources & Further Reading

• Heath, A.M., Navarre, C.B., Simpkins, A., Purohit, R.C., Pugh, D.G. (2001). A comparison of surface and rectal temperatures between sheared and non-sheared alpacas. Small Ruminant Research.
• Wittek, T., Waiblinger, S. (2017). Reactions of alpacas to shearing and accompanying procedures. University of Veterinary Medicine Vienna.
• Pallotti et al. (2020). A comparison of fleece quality and follicular activity between sheared and non-sheared yearling alpacas.
• Australian Alpaca Association - shearing
• Alpaca Association New Zealand - shearing
• Rocky Mountain Llama and Alpaca Association - heat stress
• Società Nazionale Alpaca e Lama (SNAEL) - tosatura

Common questions