Salmon return from the ocean to the stream where they hatched, and each species has a typical season: spring Chinook in the early months of the year, coho and steelhead late in the year. The biggest factor in when fish show up, though, is which river they are bound for, because each population carries a timing that is largely inherited. The best guide to a run near you is that river’s own history, with weather deciding whether this year is a little early or a little late.
Salmon Run Timing by Species
A “run” is the stretch of weeks when one group of fish moves from salt water up a river. Fish arrive over weeks, with a peak in the middle rather than all at once. Several species can overlap in one river, which gives you back-to-back runs. Typical seasons look like this:
- Chinook (king): separate spring, summer and fall runs depending on the river, with spring fish entering as early as March to May.
- Sockeye (red): mostly June through August, with Alaska’s big runs peaking in July.
- Pink (humpy): July to September, usually in odd years in much of their range.
- Chum (dog): late summer into November.
- Coho (silver): late August through November.
- Steelhead: summer and winter runs, with winter fish entering from November to April.
These are broad seasons, and no single calendar fits every river. Counts posted by state or tribal fish agencies will tell you what your river is doing.
The ranges describe when a species can show up. The peak, when the most fish are moving, is a narrower stretch within them. Fish at the start and end of a run are fewer, so arriving at the edges usually means slower fishing and less to watch.
A spring run of Chinook and a fall run in the same river behave like separate groups. Spring fish spawn higher upstream in early fall, and fall fish spawn lower down in late fall.1North American Journal of Fisheries Management. Hybridization between Spring- and Fall-Run Chinook Salmon Returning to the Trinity River, California Spring Chinook enter fresh water months earlier, carry more fat, and wait in cold pools for months before spawning.2Natural Resources (KDNR) – Karuk Traditional Ecological Knowledge and the Management of Spring Chinook Salmon. Natural Resources (KDNR) – Karuk Traditional Ecological Knowledge and the Management of Spring Chinook Salmon
The same species can also hold more than one season in a river. Some rivers have both a summer and a winter steelhead run, so the species name alone does not give you a date. A river with spring, summer and fall Chinook can offer fish for much of the year, but each run may sit in a different stretch of the river and have different rules. Find which run is in the water during your dates rather than assuming the species is present all season.
Regulation booklets use these run names. They usually list a river’s open seasons by species and sometimes by run, such as spring Chinook or winter steelhead, so the names tell you which fish the rules are written for. Seasons, bag limits and gear rules can differ between two species in the same river at the same time, so check the entry for the exact fish you want. Many rivers also have emergency orders that open, close or change a season based on how many fish are actually returning, so look for in-season updates before you travel.
Pink salmon live exactly two years, then spawn and die.3Alaska Department of Fish and Game. Pink Salmon Species Profile Odd-year and even-year pinks are therefore unrelated groups that never interbreed, even on the same spawning beds.4Alaska Department of Fish and Game. Pink Salmon Species Profile A river can have a huge run one year and almost none the next, and some rivers, like the Fraser, get pinks only in odd years.5Canadian Journal of Zoology. Influence of photoperiod on the timing of reproductive maturation in pink salmon (Oncorhynchus gorbuscha) and its application to genetic transfers between odd- and even-year spawning populations
Why Each River Has Its Own Timing
Timing is built into the fish. In Chinook, one small stretch of DNA explains about 95% of differences in migration timing across more than 50 populations.6Washington State University. THE REGULATORY UNDERPINNINGS OF SEASONAL RUN-TIME VARIATION IN CHINOOK SALMON, ONCORHYNCHUS TSHAWYTSCHA That stretch tracks when fish migrate, not how fat or mature they are,7PubMed. A complex phenotype in salmon controlled by a simple change in migratory timing and the same genetic pattern shows up across three separate Chinook lineages.8PubMed Central. Genomic region associated with run timing has similar haplotypes and phenotypic effects across three lineages of Chinook salmon A run returns at nearly the same time each year because the fish carry that timing with them.
That is why differences between rivers outweigh yearly swings. In Baltic Atlantic salmon, entry timing differed far more from river to river than from year to year.9Current Zoology. Variation in the timing of river entry of Atlantic salmon (Salmo salar L.) in the Baltic Within one big river system, fish bound for small side streams arrived earlier, around June 20 to 22, than fish for the main river.10PubMed Central. Temporally stable population-specific differences in run timing of one-sea-winter Atlantic salmon returning to a large river system In Alaskan sockeye, stream spawners migrated before river spawners, matching their earlier spawning.11Transactions of the American Fisheries Society. Spatial and Temporal Patterns of Upriver Migration by Sockeye Salmon Populations in the Wood River System, Bristol Bay, Alaska Odd- and even-year pinks in the same river ended up with almost the same timing, shaped by local conditions.12PubMed. Independent lineages in a common environment: the roles of determinism and contingency in shaping the migration timing of even- versus odd-year pink salmon over broad spatial and temporal scales
Two rivers a short drive apart can hold runs of the same species that arrive weeks apart, because each run’s timing is matched to its home stream. A report from one river is only a loose guide to the next river over.
Distance matters too. Fish headed for spawning grounds far upstream often enter the river earlier, since they have a longer trip and must arrive in time to spawn. In the lower river, you may see those early fish pass before fish bound for nearby tributaries arrive, so the same spot can hold different groups at different times.
For planning, look for several years of counts or catch reports on your target river and find when fish began to show, peaked and tapered off. Last year’s dates on that river predict this year far better than a regional average. Check current counts shortly before you go to see whether this year is running early or late.
What Triggers Fish to Enter the River
Flow matters most when water is low. Atlantic salmon took longer to enter a river when flows were lower than usual.13Journal of Fish Biology. The relationship between river flow and entry to the Aberdeenshire Dee by returning adult Atlantic salmon In dry spells, fish tended to move on days when flow had risen since the day before, but at high flows a rise made little difference.14Journal of Fish Biology. The relationship between river flow and entry to the Aberdeenshire Dee by returning adult Atlantic salmon In one big northern river, few measured conditions predicted entry at all, and those that did changed between years.15Journal of Fish Biology. Early‐season river entry of adult Atlantic salmon: its dependency on environmental factors
After a dry spell, a rising river often brings a push of fresh fish, and fresh fish are often the most willing biters. This is a tendency, not a guarantee, since the cues vary by river and season. In a river already running high, more rain rarely changes much. A storm during a wet period is a weaker reason to expect a new wave than a storm after dry weather, so check the river’s flow level, if your state publishes it, before counting on a rain bump.
A rising river also tends to turn muddy, and fish are hard to catch while the water is high and dirty. Wait until it has peaked, begun to drop, and cleared enough to see into, then fish the fresh arrivals.
Fish often stage in estuaries waiting for the right water, then move upstream quickly once conditions change. Ocean conditions months earlier can also shift arrival, as with Fraser sockeye.
Many steelhead anglers look for water above 40°F, rising flows, and changing day length together. That rule of thumb comes from angling guides rather than measured studies, and it varies by river.16High Class Tackle Co.. How Steelhead Enter Rivers: Migration Guide for Anglers Some Alaskan communities have long tied Chinook arrival to migrating birds, plant growth, and winter winds along the coast.17Alaska Sea Grant, University of Alaska Fairbanks. Natural Indicators of Salmon Run Timing and Abundance
How Warm Water and Climate Change Shift Runs
At Auke Creek, Alaska, adult coho now return about 17 days earlier than in the 1970s.18USDA Climate Hubs. When Do the Salmon Run? Timing by Species and Region Pink salmon there also show earlier adult returns tied to warmer water.19Global Change Biology. Climate warming causes phenological shift in Pink Salmon, <i>Oncorhynchus gorbuscha</i>, behavior at Auke Creek, Alaska Since 1995, late-run Fraser River sockeye have entered the river earlier, and early entry has come with many more fish dying before spawning.20Fisheries Oceanography. A matter of timing: the role of ocean conditions in the initiation of spawning migration by late‐run Fraser River sockeye salmon (Oncorhynchus nerka) Arriving early means more time in warm water burning stored energy, and fish do not feed upstream, so delays cut into their reserves.
Fish move fastest at around 16–17°C (61–63°F).21Transactions of the American Fisheries Society. Effects of Water Temperature and Flow on Adult Salmon Migration Swim Speed and Delay Above about 68°F day and night, salmon on the Columbia stop and wait for cooler water.22E&E News by POLITICO. Record salmon migration runs into hot water At 70–72°F, water can be too warm to pass and can kill fish, and salmon at Seattle’s Ballard Locks hold for days or weeks.23Long Live The Kings. Heat Wave: Seattle salmon face lethal water temperatures on a challenging migration A summer heat wave can therefore pile fish up below a dam or river mouth.
At the water, fish crowd into the coolest spots they can find: deep pools, cold tributary mouths, river mouths and the water below dams. Many fish bunched in one place and not moving upstream may be waiting for cooler water rather than simply being uninterested in biting. They can look like easy targets, but they are under stress, and handling them adds to it.
Some regions close or limit fishing when water temperatures are high. Rules can change on short notice, so check your state agency’s current notices before you go, even if the regular season is open.
Water is typically coolest in the early morning, when the stress on fish is lowest. If you fish in warm conditions where it is allowed, going early and keeping fish in the water as much as possible reduces harm.
How Long the Upstream Trip Takes
On a big river, the trip takes weeks. Spring Chinook took about 27 days, between 18 and 42, to travel between two Columbia River dams.24John Wiley & Sons, Ltd.. Evaluation of energy expenditure in adult spring Chinook salmon migrating upstream in the Columbia River Basin: an assessment based on sequential proximate analysis Slower fish burned 5 to 8% more muscle energy than fast ones.25John Wiley & Sons, Ltd.. Evaluation of energy expenditure in adult spring Chinook salmon migrating upstream in the Columbia River Basin: an assessment based on sequential proximate analysis By death after spawning, they had used up almost all of their muscle stores.26John Wiley & Sons, Ltd.. Evaluation of energy expenditure in adult spring Chinook salmon migrating upstream in the Columbia River Basin: an assessment based on sequential proximate analysis
That means the date fish enter the river mouth is not the date they reach a spot far upstream. If you are far inland, look at counts at a downstream site and expect fish to reach you some weeks later.
Dams add delays. Passing the Columbia and Snake dams takes two to four weeks depending on species.27University of Washington. Effect of spill on adult salmon passage delay at Columbia River and Snake River dams Water released through spillways for young fish adds about a day.28University of Washington. Effect of spill on adult salmon passage delay at Columbia River and Snake River dams Fish that fall back over a dam and climb again, and steelhead that duck into cold side streams, take much longer.29Transactions of the American Fisheries Society. Hydrosystem, Dam, and Reservoir Passage Rates of Adult Chinook Salmon and Steelhead in the Columbia and Snake Rivers
Many dams have fish ladders with viewing windows where you can watch fish pass, and many post daily counts online. Counts rise days to weeks after fish enter the river mouth, so they trail the start of the run. Check them before you travel so you can pick a day when fish are actually passing, not just a day within the season.
Why Varied Timing Keeps Runs Strong
When runs arrive at different times, a bad stretch of weather or water hits only part of the fish rather than all of them. Steelhead groups with differing life patterns made the combined run more than 20% steadier.30PubMed. Life-history diversity and its importance to population stability and persistence of a migratory fish: steelhead in two large North American watersheds A fishery or viewing season built on many groups is less likely to fail completely in a bad year.
California’s collapsed fall Chinook lost much of that buffer because most fish came from one basin,31Canadian Journal of Fisheries and Aquatic Sciences. Weakened portfolio effect in a collapsed salmon population complex so a problem there affected the whole run. Hatchery releases have grown more uniform in size and timing over 65 years,32Ecosphere. Ecological implications of changing hatchery practices for Chinook salmon in the Salish Sea which can narrow the spread further. The loss is gradual and hard to see in a single year, but it makes runs more fragile when conditions turn bad.
Hatchery fish may arrive in a tighter window, while wild runs keep the natural range of dates. Fishing rules often treat hatchery and wild fish differently, so check which ones you may keep.