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
Moose gestation is 235 days — approximately 33.6 weeks or 7.7 months. 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
How long are moose pregnant?
Moose are pregnant for approximately 235 days on average, with a normal range of 225–250 days — consistent across Alaskan, Canadian, Shiras, and Eurasian Elk (moose) subspecies, despite significant size differences between them.
How big is the largest member of the deer family?
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.
Are moose good swimmers?
Yes, remarkably so — 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.
What happens during moose 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.
Do moose usually have twins?
Twin calves are common in moose when food is abundant and the mother is in good body condition — unlike most deer species, well-fed moose cows frequently give birth to two calves rather than one, a reflection of how strongly moose reproduction responds to available nutrition.
How fast do moose calves grow?
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.
Do wolves prey on moose calves?
Yes — 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.
How are ticks affecting moose populations?
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.
Sources & References
- IUCN Red List — Moose conservation status
- Merck Veterinary Manual — Cervid reproduction
Related Calculators
Kanika
Researched and reviewed by Kanika, founder of GestationCalc. All gestation data is verified against primary veterinary and agricultural sources before publication.
Last reviewed: September 4, 2026