May: the covered bridge and the stocking truck
The Piscataquis begins where its East and West Branches meet in Blanchard, runs out of the woods at Abbot onto Route 6 and 15, and passes Guilford, Sangerville and Dover-Foxcroft before turning east for Sebec, Milo and Howland. The trout fishing most people mean is the Guilford to Dover-Foxcroft water in May, and it is a stocked fishery. The 2025 IFW report lists brook trout and nothing else in the river: 750 10-inch fish at Guilford on May 1, more at Guilford on May 2 and May 6, 1,500 there on May 6 and 2,475 on May 21, 750 at Dover-Foxcroft on May 1, 6 and 7 with 825 on May 20 and 1,650 on May 21, and 400 to 440 each at Blanchard Township and Monson in early and late May. Phil McPhail, who grew up on the river, says you will see anglers above and below the covered bridge in Guilford and that moving half a mile up or down leaves them behind. He also mentions hooking his first Atlantic salmon here while trout fishing; that is a fish you must release the moment you recognize it.
June and July: holdovers, then the bass take over
Once the trucks stop, the fishing is for holdovers that have spread out of the stocking points, and the Guilford to Dover-Foxcroft reach is year-round artificials water with a two-brook-trout limit, which keeps some of them in the river. By July this is a warm river. McPhail describes Milo to Howland as a quiet canoe trip with abundant smallmouth and the chance of a landlocked salmon or brook trout where cold tributaries come in; below Dover the Sebec River joins at Milo and the Pleasant River comes in just downstream, and their mouths are the cold seams. The Appalachian Mountain Club and the Atlantic Salmon Federation began a partnership in 2024 to restore salmon and brook trout habitat on the Pleasant, which drains AMC's Maine Woods lands, so that tributary is the one to watch.
Two gauges, two different rivers
This page reads USGS 01031500 near Dover-Foxcroft, which drains 296 square miles and sits at the bottom of the trout reach. The other listed gauge, 01034000 at Medford, is a different animal: 1,162 square miles, below the Sebec and Pleasant, reading the smallmouth water. No shop publishes a wading number for either. The 150 to 500 cfs band here comes from the Dover-Foxcroft record and should be read that way. Monthly medians since 1902 are about 2,060 cfs in April, 1,110 in May, 370 in June, 170 in July, 110 in August and September, 290 in October and 540 in November. In other words the May stocking often goes into a river running four figures, the fishable drop to a few hundred comes in late May or June, and by August a reading in the low hundreds is a normal summer, not a drought. Wikipedia's summary of the USGS record puts the extremes at 37,300 and 5 cfs, which is the whole story of a freestone with no dam upstream.
Fall: the artificials stretch is the only stretch
From October 1 the general river season is closed in the North Zone, and the Piscataquis is a North Zone river above Medford. The reason to be here in October is the Guilford dam to Sebec-Atkinson bridge reach, which stays open all year under artificial lures only, and the section from the Sebec-Atkinson bridge to the Trestle Road bridge in Medford, which reopens October 1 to November 30 for artificials with everything released. The salmon are the other fall story. The Howland Dam bypass channel, finished in 2016 as part of the Penobscot restoration, lets sea-run fish reach the Piscataquis for the first time in generations, and the whole river is Atlantic salmon habitat again. There is no season on them. Fishing is prohibited inside the Howland bypass and within 150 feet of its upstream and downstream junctions with the river.
Hatches, with a caution
Nobody publishes a Piscataquis hatch chart. The stocked brookies of May and June eat what the region's freestones produce, and the timing below is taken from Perfect Fly's Penobscot sampling and the Maine-wide FlyFishFinder chart, pushed a week later than the lower Kennebec: Blue-Winged Olives from April, Hendricksons in the second half of May, caddis from late May through summer, March Browns and Light Cahills in June, yellow stoneflies in June, terrestrials from July, olives again in September. Treat it as a regional calendar, not a river-specific one.
Guilford dam to the Sebec-Atkinson bridge, and the rest
The 2026 lawbook carries two entries. Piscataquis River, Guilford to Medford, is North Zone water: from the dam in Guilford downstream to the Sebec-Atkinson bridge, including tributaries up to their first road crossing, it is open to open water fishing January 1 to December 31, artificial lures only, with a daily limit of two brook trout (S-19); from the Sebec-Atkinson bridge to the Trestle Road bridge in Medford live baitfish are permitted (S-11), and the reach is open October 1 to November 30 under artificial lures only with all trout, salmon and togue released. Piscataquis River, Medford to Howland, is South Zone: from the Trestle Road bridge to the Penobscot confluence it likewise opens October 1 to November 30 for artificials with everything released, on top of the South Zone's year-round general season. Above Guilford, the river runs under North Zone general law: April 1 to August 15 with bait allowed except live fish, August 16 to September 30 artificials and flies only with one brook trout and one salmon, closed October 1 to March 31, and a five-fish general brook trout limit with a 6-inch minimum in rivers.