The Boundary Waters paddling season runs from ice-out — around May 5 on the lakes we track — until freeze-up near Nov 29. Within that window, the trade-offs are real: spring is empty but cold, June is buggy, midsummer is warm and crowded, and September is the quiet, golden reward. Here's how to choose.
Ice-out & spring (late April – May)
Ice typically clears in May 5. The first open-water weeks bring cold water, hungry fish, roaring waterfalls, and near-total solitude — but also unpredictable weather and the risk of a late freeze on the northern border lakes.
Early summer (June)
Long days, warming water, and peak fishing — but also peak bugs. Blackflies crest in late May and June, and mosquitoes follow. Head nets and a good tent earn their keep.
Peak season (July – August)
Warm, swimmable water, ripe blueberries, and the most reliable weather — and the most people and the tightest permit quotas. Reserve popular entry points months ahead.
Fall (September – early October)
The insider's season: bugs gone, crowds thin, aspen and tamarack turning gold, and aggressive fall fishing. Nights get cold fast, and the quota season ends September 30.
Ice-out dates by lake
Median dates from Minnesota DNR ice records, across 18 Boundary Waters lakes with enough observations. Many wilderness lakes have no formal ice record — these are the tracked ones.
| Lake | County | Median ice-out | Median ice-in | Ice-free days |
|---|---|---|---|---|
| Basswood Lake | Lake | May 5 | — | — |
| Bearskin Lake | Cook | Apr 28 | Nov 26 | 212 |
| Brule Lake | Cook | May 5 | — | — |
| Burntside Lake | St. Louis | Apr 30 | Dec 2 | 216 |
| East Bearskin Lake | Cook | May 6 | — | — |
| Esther Lake | Cook | May 13 | — | — |
| Fall Lake | Lake | Apr 28 | — | — |
| Farm Lake | Lake | Apr 28 | Nov 27 | 213 |
| Gunflint Lake | Cook | May 6 | Dec 9 | 217 |
| Hungry Jack Lake | Cook | May 5 | Nov 25 | 204 |
| Little Gunflint Lake | Cook | May 6 | Dec 9 | 217 |
| Little Long Lake | St. Louis | Apr 28 | Nov 29 | 215 |
| Moose Lake | Lake | May 7 | — | — |
| Rove Lake | Cook | May 5 | Dec 8 | 217 |
| Sawbill Lake | Cook | May 7 | Nov 12 | 189 |
| Snowbank Lake | Lake | Apr 29 | — | — |
| Sucker Lake | Lake | May 5 | — | — |
| Triangle Lake | Lake | Apr 25 | — | — |
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Frequently Asked Questions
Across the lakes we track ice data for, the median ice-out lands around May 5, with the border and deeper lakes clearing last. Cold years can push it into mid-May.
September is the paddler's favorite — settled weather, fall color, strong fishing, and almost no bugs or crowds. July and August have the warmest water but the most people; June has great fishing but the worst bugs.
Blackflies peak in late May and June; mosquitoes run June into July. By late August and September the bugs largely disappear. A head net, permethrin-treated clothing, and a bug-proof tent make June trips comfortable.
Ice-out data: Minnesota DNR ice-out records. Season and permit timing: USDA Forest Service, Superior National Forest.