When to come
The best time to fish Okanagan Lake
The honest answer is the one most visitors do not expect: the worse the weather looks, the better the fishing usually is. Every month, from ten years of data and forty years on the water.
The short version
If you want a genuinely big rainbow trout, come between October and April. If you want a comfortable few hours on a beautiful lake with a good chance of fish, come between June and September. Those are different trips and it is worth being honest with yourself about which one you are booking.
Why the cold months are the good ones
Through the warm half of the year the big rainbows in Okanagan Lake spend most of their time deep, where they are hard to reach and harder to tempt. As the water cools they follow the kokanee up into the top of the water column, and that is when a bucktail trolled a long way behind the boat becomes the most effective thing you can put in front of them.
It is also when the lake empties. Most boats in the valley are out of the water by November, so you often have entire stretches to yourself.
What the kokanee are doing, and why you should care
Kokanee are the food supply. They colour up and stage to spawn from late summer into autumn, gathering in numbers, and the rainbows move in behind them. That is why the fishing noticeably sharpens through September and October rather than simply switching on in December.
If you want the background on that relationship, it is on the species page, along with the story of the shrimp introduction that nearly wiped the kokanee out.
Month by month
What an average year looks like here
Daily highs, lows and how often it rains or snows, averaged over 2015–2024 for this exact spot on the lake. Highlighted months are trophy rainbow season.
| Month | Daily range | Wet days | What the fishing does |
|---|---|---|---|
| January Trophy season | -3° to 3° | 43% | Deep in the trophy season. Cold, quiet, and the best big-fish odds of the year. |
| February Trophy season | -4° to 4° | 36% | Still prime bucktail water. Almost nobody else is out here. |
| March Trophy season | -1° to 9° | 30% | Trophy season running out, and the fish start to move up. |
| April Trophy season | 3° to 15° | 27% | The last of the big-fish window, with far more comfortable days. |
| May | 8° to 21° | 25% | Warming up. Good general fishing and a pleasant day on the water. |
| June | 12° to 25° | 24% | Early mornings and evenings are the productive windows. |
| July | 15° to 30° | 13% | Hot and dry. Fish early in the morning or late in the evening. |
| August | 16° to 30° | 13% | The busiest month on the lake. Early starts beat the boat traffic. |
| September | 13° to 22° | 25% | Cooling off, crowds gone, and the fishing picks up again. |
| October Trophy season | 7° to 14° | 35% | Trophy season opens. The big rainbows start coming up to feed. |
| November Trophy season | 1° to 7° | 47% | Cold, wet, and one of the best months of the year to be out here. |
| December Trophy season | -2° to 2° | 48% | Heated boat weather, and genuinely good fishing. |
We deliberately publish no average wind figure — the climate model smooths this valley so badly it would tell you the lake is never rough. Wind is on the wind page, as a live forecast.
Picking a day once you have picked a month
Two things decide a good day rather than a good month. First the wind, which decides whether the trip runs at all and is the only one worth phoning about. Second the major and minor feeding windows, which are worth using to choose between two otherwise equal mornings.
And if you would rather just ask a human which week to take, that is what the phone is for.
Common questions
What is the best month to fish Okanagan Lake?
For a trophy rainbow, anywhere from October through April, and the deep winter months are often the very best of those. That is when the big fish come up out of the depths to chase kokanee and a trolled bucktail is at its most effective.
For comfort, scenery and a family trip, June through September.
Can you fish Okanagan Lake in winter?
Yes, and it is our best season. Okanagan Lake does not freeze. The boat is heated and covered, which is the only reason fishing December and January is pleasant rather than an endurance test.
It is also the emptiest the lake gets. Most boats in the valley are on the hard by then.
When do the kokanee spawn, and does it matter?
Kokanee colour up and stage to spawn from late summer into autumn. It matters a great deal, because kokanee are what the big rainbows eat. When they gather, the rainbows follow, which is why the fishing sharpens through September and October.
Is summer a waste of time for big fish?
Not a waste, but be realistic. Summer fishes well early and late in the day and it is a lovely time to be out. If the entire point of your trip is a genuinely large rainbow, plan it for the cold months instead.
Know which month you want?
Call or text Geoff with a rough week and he will tell you straight whether it is worth it.