Moose Gestation Calculator
This moose gestation calculator finds the expected birth date instantly. Select your subspecies and enter the mating date to calculate the gestation period and view key milestones.
Quick Answer
The gestation period for moose averages 235 days, with a normal range of 225–250 days. The moose is the largest member of the deer family. Enter your mating date above for an exact expected birth date.
Moose Gestation Calculator
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The Largest Deer on Earth
The moose is the largest living member of the deer family, with bulls weighing up to 1,500 lbs and standing over 6 feet tall at the shoulder — dwarfing every other deer species, including elk, reindeer, and white-tailed deer. Despite this massive size, moose are surprisingly agile, both on land and in water.
Excellent Swimmers
Moose can dive up to 18 feet underwater to feed on aquatic plants and are capable of swimming up to 6 miles at a stretch. This strong swimming ability lets moose access food sources and escape predators that other large land mammals simply cannot reach, and is a defining part of their ecological niche in northern wetland habitats.
A Dramatic Rut
Moose rut is one of the most dramatic breeding displays in the animal kingdom: bulls strip the velvet from their antlers in September, then engage in loud bugling calls and violent antler-clashing fights to establish dominance. Successful dominant bulls go on to mate with multiple cows during the peak rutting period, typically late September through October. When food is abundant and cows are in good body condition, twin calves are common — a reflection of how strongly moose reproduction responds to available nutrition.
Extraordinarily Fast Calf Growth
Moose calves grow extraordinarily fast — gaining roughly 2 lbs per day during their first months of life and reaching around 300 lbs by autumn, just a few months after birth. This rapid early growth is essential preparation for surviving their first winter in harsh northern climates.
Wolves & the Winter Tick Crisis
Wolves are a primary predator of moose, and wolf packs will coordinate deliberately to separate a vulnerable calf from its mother, since a healthy adult moose can be extremely dangerous to attack directly. This predator-prey relationship has been extensively studied, particularly on Isle Royale in Lake Superior, as a classic ecological case study.
Climate change is allowing winter tick populations to grow far larger and survive longer than historically typical, and heavily infested moose — some carrying up to 100,000 ticks on a single animal — can suffer severe blood loss, hair loss, and even death. This tick crisis has devastated moose populations in parts of New England and is considered one of the clearest examples of climate change directly harming a large mammal species.
Gestation by Subspecies
| Subspecies | Avg. Gestation | Notes |
|---|---|---|
| Alaskan Moose | 235 days | Largest subspecies |
| Canadian Moose | 235 days | Widespread across boreal Canada |
| Shiras Moose | 235 days | Smallest North American subspecies |
| Eurasian Elk | 235 days | European/Asian name for moose |
How Moose Gestation Compares to Other Cervids
| Species | Avg. Days | Vs. Moose |
|---|---|---|
| Elk | 245 days | 10 days longer |
| Moose | 235 days | — |
| Reindeer | 228 days | 7 days shorter |
| White-tailed Deer | 201 days | 34 days shorter |
See our reindeer gestation calculator and deer gestation calculator.
How We Calculate Moose Gestation
The moose gestation calculator uses the formula: Birth Date = Mating Date + 235 days. The average is derived from published wildlife biology research.
Frequently Asked Questions
Sources & References
- IUCN Red List — Moose conservation status
- Merck Veterinary Manual — Cervid reproduction
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GestationCalc Editorial Team
Our editorial team includes animal husbandry specialists, veterinary consultants, and agricultural extension educators. Content is reviewed against peer-reviewed research and guidance from USDA, Penn State Extension, and the Merck Veterinary Manual.
Last reviewed: September 4, 2026