Yellowstone Wolf
Wolves are the species that made Lamar Valley famous. Reintroduced in 1995 after a 70-year absence, they've grown into one of the most closely studied and most-watched predator populations on Earth.
Overview
Gray wolves (Canis lupus) were eradicated from Yellowstone by the 1920s and reintroduced in 1995–1996 when 31 wolves from Canada were released. The population grew rapidly, peaked around 174 in 2003, and now fluctuates around 100 animals in roughly 10 packs.
Yellowstone — especially the northern range — is one of the best places in the world to watch wild wolves because of the open terrain, concentrated prey, and year-round road access. Every pack's territory is mapped from NPS monitoring data.
Where to find them
- Lamar Valley: The wolf capital — Lamar Canyon and Junction Butte packs hunt here at dawn.
- Slough Creek: Historic denning area; wolves often on surrounding slopes.
- Soda Butte / Little America: Eastern corridor of the northern range.
- Yellowstone Northern Range (whole): The road from Tower to the NE Entrance is the wolf-watching spine.
When to look
January through April are the most reliable months — snow makes wolves visible and prey concentrates in the valleys. Dawn is essential. Bring a spotting scope; wolves are often a mile or more away.
⚠️Stay at least 100 yd away
Frequently asked questions
Why were wolves reintroduced to Yellowstone?+
After 70 years without wolves, elk herds had grown very large and the ecosystem was out of balance. The 1995 reintroduction restored a top predator, triggering cascading effects — including the famous recovery of willow and beaver along some streams.
Do I need a spotting scope to see wolves?+
Usually, yes. Northern-range wolves are frequently a mile or more from the road. Binoculars find them; a scope (30–60x) is what lets you actually watch behavior. Many watchers share views — if you see a cluster of scopes, ask politely for a look.
How many wolves live in Yellowstone now?+
The 2024 NPS count was 108 wolves across 9 packs. The population peaked around 174 in 2003 and has since regulated lower as territories filled and natural mortality (chiefly wolves killing wolves) balanced reproduction.
Can I see wolves year-round?+
Yes, but winter and early spring are far easier — snow contrast, concentrated prey, and no foliage. Summer viewing is harder because wolves retreat to cover and heat.
Data & field guide
2,558 aggregate reports. Peak: Apr. Sighting frequency, not population abundance.
8,654 timed records. Daylight viewing bias applies.
Field identification: tracks & sign
Canis lupus · Canidae
Tracks
- Front foot
- 100–140mm × 90–120mm
- Hind foot
- 90–120mm × 70–100mm
- Track width
- 9–12cm
- Toes
- 4
- Stride
- 60–90 (trot), 40–60 (walk)cm
Claws normally show in track (non-retractile). Claw marks are small dots just ahead of each toe pad.
Scat & other sign
Rope-like or segmented, often with twisted/tapered ends. Diameter 25–35mm. Frequently contains hair (elk, deer, bison), bone fragments, and teeth. Often deposited on trails, roads, or prominent features (scent-marking).
Diameter: 25–35mm
Key identification features
- Large symmetrical track (front >10cm long)
- Claw marks visible ahead of toes
- Direct-register trot in straight line
- Hair-rich scat with bone fragments
- Pack trails (multiple sets of tracks in single file)
- Three-lobed main pad
ℹ️In the field
annual
2024 wolf population and pup survival
Pup survival and pack size help explain which valleys may have more visible wolf activity in the current report year.
At the end of 2024, NPS counted 108 wolves in 9 packs with 7 breeding pairs; at least 41 pups were produced and 37 survived.
annual
Pack formation and dissolution change viewing expectations
Use current annual reports before relying on remembered pack names; several 2024 packs dissolved, shifted, or formed.
Bliss Pass and Dunanda Falls formed and raised pups, while Lupine Creek, Firehole River, and the 1330F/1336M group dissolved.
annual
Wolf kills reveal elk and bison interaction cues
When a visible kill is present, watch the wider scene for wolf returns, ravens, coyotes, and grizzlies from the road.
NPS detected 211 wolf kills in 2024, including 126 elk and 47 bison.
Do not approach carcasses or leave roads to inspect kill sites.
Nov-Mar
Habitat cue
Snow contrast on open northern-range slopes and valley floors
Snow and reduced vegetation improve long-distance detection while winter prey studies are active.
Year-round
Habitat cue
Visible carcass scenes with ravens, coyotes, grizzlies, or wolf returns
The 2024 report documents wolf-killed elk and bison plus multi-predator scavenging scenes.
Observe only from legal roadside distance; never walk to a carcass.
Sources & data notes
- Seasonal and hourly patterns: aggregated from NPS and observer trip reports in the project dataset (1995–2026). Only monthly counts are published; no per-sighting location or observer data.
- Report signals: official NPS/USGS aggregate or narrative report facts only. Exact dens, raw sightings, and bear-jam points are not published.
- Track & sign field guide: compiled from NPS species references and field-identification literature.
- NPS Yellowstone Wolf Project Report 2024 — National Park Service (Values may be parsed or inferred from annual report text.)
30 years of wolf data
Month-by-hour activity pattern from aggregate timed reports; sunrise and sunset are context lines, not sighting records.
Annual wolf count and pack count shown as separate panels so the two scales do not compete.
Official NPS detected wolf kills by prey species, with latest-year elk and bison age/sex summaries below the bar.
Annual recorded wolf deaths by cause, with the latest-year mix summarized below the bars.
Average active years by pack formation cohort.
Sources & data notes
- Population, mortality, and pack data: Yellowstone Wolf Project annual reports (NPS), 1995–2024.
- Activity heatmap: commercial-safe aggregate timing only. Den locations and per-sighting records are not published.
- NPS Yellowstone Wolf Project Report 1995-1996 — National Park Service (Values may be parsed or inferred from annual report text.)
- NPS Yellowstone Wolf Project Report 2002 — National Park Service (Values may be parsed or inferred from annual report text.)
- NPS Yellowstone Wolf Project Report 2024 — National Park Service (Values may be parsed or inferred from annual report text.)
- NPS Yellowstone Wolf Project 95% MCP shapefiles — National Park Service (95% MCP convex polygons include unused area and do not indicate use intensity.)
Sources & data notes
- Wolf data is drawn from official NPS, USGS, and NOAA sources catalogued in our source registry. Observer-submitted sightings are not published on this public guide.
- Wolf carries dedicated official data (NPS ecology / management reports).
- NPS Yellowstone Wolf Project Report 2024 — National Park Service (Values may be parsed or inferred from annual report text.)
- NPS Yellowstone Wolf Project Report 2012 — National Park Service (Values may be parsed or inferred from annual report text.)
- NPS Yellowstone Wolf Project 95% MCP shapefiles — National Park Service (95% MCP convex polygons include unused area and do not indicate use intensity.)
Spotted something off, or want a deeper dive? Every claim above links to its original source — look for the ↗ markers and the Sources section.