BirdTroutOpen the map Saint Croix River fishing report
63.5–63.7 °F across 2 gauges on the Saint Croix River, read from USGS and re-read when this page loaded. No reporting stretch is in the cold band right now, so fish the first hours of light and the tributary mouths. September is Blue-Winged Olive, Cranefly, Green Rock Worm / Green Weenie and Caterpillar in this region — 15 insects are recorded as active.
Water temperature right now
| Gauge | Reading | July mean | Read at |
|---|---|---|---|
| St. Croix River at St. Croix Falls | 63.5 °F | 77.2 °F | 30 Sep 2026, 13:00 UTC |
| St. Croix River at Stillwater | 63.7 °F | 77.2 °F | 30 Sep 2026, 13:15 UTC |
Read from USGS instantaneous values when this page was built, and rebuilt nightly. The colour is the same four-band scale the map paints from.
What is hatching in September
| Insect | Hook | Active at |
|---|---|---|
| Blue-Winged Olive | #16–22 | 38–58 °F |
| Cranefly | #6–10 | 40–65 °F |
| Green Rock Worm / Green Weenie | #10–14 | 45–68 °F |
| Caterpillar | #8–14 | 55–75 °F |
| Crayfish | #4–8 | 55–78 °F |
| Black Ant | #14–20 | 55–80 °F |
| Isonychia / Slate Drake | #10–14 | 55–70 °F |
| Leafhopper | #18–22 | 58–75 °F |
| Little Yellow May | #16–18 | 58–70 °F |
| Grasshopper | #8–12 | 60–80 °F |
| Trico | #20–24 | 58–72 °F |
| White Miller | #14–18 | 60–74 °F |
| Cinnamon Flying Ant | #16–20 | 58–78 °F |
| October Caddis | #8–10 | 45–58 °F |
| Water Boatman | #14–18 | 45–65 °F |
The rest of the state
This is one river. The Wisconsin report covers every region at once, and is refreshed at the same time as this page.
More about Saint Croix River
Saint Croix River — live water temperature, regulations and access
- When to fish the Saint Croix River, Wisconsin
- How to get to the Saint Croix River, Wisconsin
- Saint Croix River fishing regulations