
Seasons
The big sea-run brown trout start to return
to the pools of the Rio Grande in significant numbers around Thanksgiving.
Less than a month later the river is loaded
with fish and it is estimated that by the first day of each New
Year, nearly 80% of the escapement has reached their annual family
reunion. That translates into more than a thousand monster
trout per river mile. The fish initially herd up in the best lower
river pools, though hundreds more of the silver sea trout continue
to pour into the Rio Grande on every high tide, twice a day until
sometime in May. The most sought after dates are February and
March, the center and most pleasant part of the short, near-Antarctic
summer.
Because the most productive week of the
season shifts ever year and can’t be consistently targeted
on the calendar, the best time to be on the Rio Grande is unpredictable.
But it’s all good! Consider that thousands of these huge
fish are caught each season, yet when population studies are compared
to accurate catch records, it’s clear that a surprisingly
small number of the fish present (which don’t actively feed
after they return to the river) actually end up being hooked.
What triggers their aggressive behavior and when it happens is
arguable, but what can’t be challenged is that every week
on the Rio Grande can be, and usually is phenomenal.
Time your Trip for January, February,
March, or the first two weeks of April. While mid-season
offers the most pleasant weather, the best weeks ever recorded
have been the last weeks of the season. Randy Berry and his friends
from Teton Valley Lodge once averaged 53 fish per rod during what
some consider to be the most difficult week of the Tierra del
Fuego summer.
Early season fish are very aggressive,
full of fight, and acrobatic. They move readily to dries,
and three of the largest sea trout ever recorded were caught and
released in January. The most productive weeks of the season shifts
each year and can’t be consistently targeted on the calendar.
The best week to be on the Rio Grande is whichever best suits
your schedule. In fact, when the weather cooperates, nearly every
day of the season is good!

Geography of the Rio Grande
Though most of the Rio Grande is on
the Chilean side of the border, nearly 80% of the prime spawning
habitat and all of the Rio Grande’s best fishing is on
the Argentina portion of the island, much of it in the first
45 miles above where the river enters the sea.
The fences of Maria Behety surround hundreds of square miles
of grazing land and this huge estancia borders nearly 32 miles
on the north bank of the river. The estancia alternates daily
the use of more than 50 kilometers (102 pools) with the three
lodges on the opposite side of the Rio Grande in a friendly
and well-organized rotation that insures a quality, private
fly fishing experience for everyone.
The lodges on the opposite, southern
riverbank are Despedida, Kau Tapen, and Villa Maria (part of
Kau Tapen). The upstream estancias separating Maria Behety
and Kau Tapen from nearby Chile border increasingly shallow
pools, more marginal spawning habitat, and fewer and fewer sea
trout. Resident brown and rainbow trout fishing in the tributaries
and the Rio Grande headwaters is excellent.
The maximum combined occupancy of all
the Rio Grande lodges between the Atlantic Ocean and the Chilean
border is about 50 anglers. That’s an average of
nearly a mile of private water for every single fisherman.
Meteorologists officially classify the
island of Tierra del Fuego as a subpolar oceanic climate. Summers
in Tierra del Fuego are short, dry and relatively cool while
winters are long, wet, and moderate. The northeast, where the
Rio Grande resides, is characterized by strong winds and little
precipitation while the south and west (Ushuaia) it is very
windy, foggy, and wet for most of the year, and there are very
few days without rain, slush, hail or snow. Regions in the world
with similar climates to southern Tierra del Fuego include the
Aleutian Islands, Iceland and the Alaska Peninsula.
Climate Information for Rio Grande
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Geographic position 53º 46' S / 67º 42' W
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Temperatures Annual mean temperature 5.5ºC,41.9ºF
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July mean temperature -0.2ºC, 31.64ºF
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January mean temperature 10.1ºC, 50.18ºF
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Highest summer temp. (1992) 23.9ºC, 75.2ºF
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Lowest winter temperature (1992) -16.7ºC,
1.94ºF
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Wind Quadrant W
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Average speed 30 km/h, 18.64 mph
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Highest speed 200 km/h, 124.27 mph
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Annual mean relative humidity 55%
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Annual rainfall (including snowfall) 330 mm
12.99 inches
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Annual sea surface mean temperature 7 ºC 44.6ºF
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Daylight length winter 7 h 36 min
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Daylight summer 17 h 05 min