Typical operating window
December–AprilPacific storms usually establish the operational base during late autumn and early winter.Verified planning context
Snow, weather and avalanche context
Historical patterns help you compare trips. They do not predict your week or replace the operator's daily decisions.
Strongest comparable snow evidence
1,325 mm SWE median · 1,110–1,440 mm interquartile rangeTsai Creek PillowTier B · observed reference · low confidenceSnow character
maritimeFrequent maritime snowfall builds a deep base. Colder inland flow can lower surface-snow density between storms.Public avalanche information
Avalanche Canada regional forecast mapForecast coverage depends on the exact tenure. A public region never replaces the operator assessment.Weather and flight context
Moist Pacific systems meet the Coast and Skeena ranges, producing strong elevation and windward-leeward contrasts.
- Embedded cloud and low ceiling
- Heavy snowfall rates
- Ridge wind and flat light
Meteorological reference area
Northern Coast and Skeena catalogue locations
- Includes
- Northern Coast and Skeena mountain evidence near published trips.
- Excludes
- Interior, eastern, and Bella Coola destination profiles.
- Elevation
- No verified operator-terrain elevation band is public. Each evidence value retains its site elevation.
Evidence pack
Measurements, claims and gaps stay separate.
Tier BPeak seasonal snow-water equivalent reference1,325 mm SWE median · 1,110–1,440 mm interquartile range
- Site
- Tsai Creek Pillow · 54.6500, -127.6667 · 1360 m · 46 km from the catalogue reference
- Period
- 1998/99–2010/11 complete snow seasons within the 1991–2016 archive
- Completeness
- 13 seasons with at least two valid observations; 2,313 observations used.
- Method
- Maximum SWE by October–September snow season; median and quartiles across valid seasons.
- Limitation
- This site is one mountain reference, not a tenure-wide snowfall or snow-depth value.
- Canadian Historical Snow Survey DataEnvironment and Climate Change Canada · accessed 2026-08-25
Tier CModelled snowfall water equivalent953 mm SWE median · 834–1,160 mm interquartile range
- Site
- Skeena gateway area ERA5-Land grid cell · 54.7000, -128.4000 · 4.5 km from Skeena gateway area reference point
- Period
- Calendar years 1991–2020
- Completeness
- 360 monthly means; all 30 calendar years contain 12 values.
- Method
- ERA5-Land monthly mean daily snowfall accumulation was multiplied by calendar days and 1,000, then summed by calendar year.
- Limitation
- This reference area supports evidence discovery and comparison. It is not an operating-area or tenure boundary. This unadjusted 0.1° reanalysis grid cell is not an observation, snow depth, or terrain-wide total. Grid elevation and wind redistribution can cause substantial local bias.
- ERA5-Land monthly averaged data from 1950 to presentCopernicus Climate Change Service · accessed 2026-08-26
Tier EPublished commercial snowfall claim20–30 m operator claim
- Site
- Last Frontier tenure in the Northern Coast and Skeena mountains
- Period
- Baseline period not published by the source
- Completeness
- The source does not publish the underlying observation record.
- Method
- Interested-source claim. Heliski International has not reconstructed the measurement series.
- Limitation
- This is a tenure-wide marketing claim, not an official station normal or a promise for any run.
- 2026 Last Frontier Heliskiing price listLast Frontier Heliskiing · accessed 2026-08-25
Monthly evidence
Each cell keeps its measurement type and unit. Reanalysis water equivalent is not snow depth. Text-only cells preserve a representative data gap.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 188.9 mm SWE | 121.3 mm SWE | 127.4 mm SWE | 72.5 mm SWE | 12.5 mm SWE | 0.5 mm SWE | 0 mm SWE | 0 mm SWE | 2.4 mm SWE | 80.2 mm SWE | 179.3 mm SWE | 171.4 mm SWE |
Commercial operator assessment
Operator assessment process not independently verifiedThe operator must assess current snow, avalanche terrain, weather, aircraft limits, and rescue options. No private operational plan is inferred.
Sources and evidence notes
- 2026 Last Frontier Heliskiing price listLast Frontier Heliskiing · accessed 2026-08-25
- Published operator and trip inventoryHeliski International editorial team · accessed 2026-08-25
- Canadian Historical Snow Survey DataEnvironment and Climate Change Canada · accessed 2026-08-25
- ERA5-Land monthly averaged data from 1950 to presentCopernicus Climate Change Service · accessed 2026-08-26
- Avalanche Canada forecast mapAvalanche Canada · accessed 2026-08-25
- Historical Climate DataEnvironment and Climate Change Canada · accessed 2026-08-25