Ideal Water Temperature for Fish: The Chart for 25 Freshwater Species

The best water temperature for fishing, for most freshwater game fish, is 65–75 °F (18–24 °C): that is where largemouth bass, walleye, crappie, white bass and yellow perch feed hardest. Trout and salmon want it colder, 50–65 °F (10–18 °C), and catfish and carp want it warmer, 75–85 °F (24–29 °C). The chart below gives those ranges for 25 species, with the temperature that starts each one’s spawn and the point where it stops feeding. After the chart: why every book’s numbers differ, how to read a thermometer so the number means something, and what to throw for bass in each band.

A fish’s metabolism roughly doubles with every 18 °F (10 °C) of warming and halves with every 18 °F of cooling. A bass at 55 °F needs about a third of the food a bass at 75 °F needs, which is why the same lure that gets ignored in April gets crushed in June.

The chart

The comfort range is where the species is most often caught feeding; “spawn” is the water temperature that starts spawning; “stress” is where feeding slows and the fish move to find cooler (or, for coldwater species, deeper) water. Figures are from the state fish and wildlife agencies and the three compilations in the sources (Coutant 1977, Hokanson 1977, Wismer and Christie 1987), rounded to the nearest degree; each row was checked against at least one of them; the bass, catfish and trout rows follow the sourced profiles elsewhere in the species section.

Two things stand out. The warmwater and coldwater groups barely overlap: a lake at 62 °F (17 °C) is a slow day for bass and a good one for trout, and the reverse at 74 °F (23 °C). And the spawn column is a calendar: walleye and pike go first, right after ice-out in the 40s, then crappie and white bass in the 50s, bass at 60, bluegill in the upper 60s, and channel catfish last, at 72–75 °F in early summer.

Why every chart you find disagrees

Search for this chart and you will find ten versions with different numbers, sometimes ten degrees apart. There are three honest reasons.

1. Laboratory preference is not field behavior. Coutant’s 1977 compilation, still the standard reference, lists the temperatures fish chose in tanks with a gradient. Largemouth bass in those tanks settled at 84–90 °F (29–32 °C), warmer than any angler’s chart, because a tank has food, oxygen and no reason to leave. A lake at 84 °F has less oxygen, and the bass move to shade and depth.
2. Fish adapt to their latitude. Hokanson showed that yellow perch and walleye from northern lakes spawn and feed at lower temperatures than the same species farther south, and the agencies disagree accordingly: Wisconsin puts northern pike spawning at 34–40 °F (1–4 °C), Minnesota at 40–50 °F (4–10 °C). A smallmouth in Lake Erie and a smallmouth in a Texas reservoir have different comfort ranges, and a national chart splits the difference.
3. Comfort, growth and preference are different numbers. Channel catfish grow fastest at about 85 °F (29 °C), feed well from 70 °F and survive from just above freezing to nearly 100 °F. A chart that reports “optimum” may mean any of those three.

So use the chart the way a guide uses it: as the band to start in, adjusted by what the fish tell you that day.

Measure where the fish are, not where you are

A surface reading from the boat’s sonar is the least useful temperature on the lake. Three rules make the number mean something:

• Depth. From late June a lake stratifies: a warm upper layer, a thermocline where the temperature drops several degrees in a few feet, and cold water below. Bass and walleye hold on the thermocline edge; trout and salmon live under it. A summer lake can read 82 °F (28 °C) on top and 60 °F (16 °C) at 15 ft (4.6 m).
• Time of day. In spring a shallow bay warms 5–8 °F (3–4 °C) between dawn and mid-afternoon, and the afternoon is when pre-spawn bass move up. The morning reading tells you nothing about the afternoon bite.
• Trend beats level. Fish respond to the direction of change more than to the number. A three-day warming trend in April at 52 °F (11 °C) fishes better than a stable 58 °F (14 °C) after a cold front.

What to throw for bass at each temperature

The band, the bass’s position and the lure that matches it, for largemouth and smallmouth in a typical northern-tier reservoir. Southern lakes run the same sequence a month or two earlier.

1. Below 48 °F (9 °C), winter. Bass sit deep on vertical structure: bluffs, channel drops, standing timber. Suspending jerkbaits worked with long pauses, a jig or a leadhead grub crawled along the bottom, a blade bait or spoon dropped on marked fish.
2. 48–55 °F (9–13 °C), pre-spawn. Bass move from wintering areas toward spawning flats and stage on the first structure next to them. A deep crawfish-pattern crankbait, a slow-rolled spinnerbait, a lipless crankbait over emerging grass.
3. 55–70 °F (13–21 °C), spawn. Flat, protected, shallow structure; nests in 2–8 ft (0.6–2.4 m). A tube or floating worm in clear water, a soft jerkbait in stained water, a wacky-rigged stick bait around beds.
4. 70–80 °F (21–27 °C), post-spawn to summer. Bass split: some on the first deep break, some in shallow cover. Topwater at dawn and dusk, a frog over grass, a Texas-rigged worm or a football jig on the breaks by day.
5. Above 80 °F (27 °C), high summer. Feeding windows shrink to low light, and the fish go to shade, current and the thermocline edge. Deep crankbaits and Carolina rigs on ledges, a punch rig into the thickest mat, night fishing with a black spinnerbait.
6. Cooling back through 65–55 °F (18–13 °C), fall. The best feeding of the year as bass chase shad into creeks and coves. Lipless crankbaits, spinnerbaits, walking topwaters, a swimbait when the bait balls up.

The same logic runs for every species in the chart: find where the water is in its range, and the position and the lure follow. The pages below take one species at a time, with its spawn, its feeding bands and what to throw in each; the species pages carry the rest for largemouth bass, smallmouth bass and channel catfish, and the techniques hub holds the knots and the basics. What the weather, the barometer and the moon do to the bite is on the conditions hub.