Striped Bass Surge Through Gulf of Maine on Peak Herring Runs
Water temperatures of 47 to 48°F recorded by NOAA buoys 44007 and 44027 are running cool for late May, but cold water has not slowed what The Fisherman — South Shore MA to ME describes as a striper bite that has gone full tilt in the matter of one week. Surfland Bait and Tackle confirms the season is in full swing, with the most consistent action on larger fish coming from inside the Merrimack River while the herring run remains strong. Reports from the same region place bass well into the 30-pound class pushing herring up coastal rivers and hitting plugs and plastics across the board. Capt. Tom of Beauport Fishing Adventures is marking fish well into the 20-pound class chasing mackerel inshore, with early sightings of pogies in local lobster traps signaling that bait diversity is building toward the heart of the migration. Flounder adds a reliable secondary target, with decent catches noted across the zone.
Current Conditions
- Water temp
- 48°F
- Moon
- Full Moon
- Tide / flow
- Full moon driving strong tidal exchanges; 3.9-foot seas at buoy 44007 and 2.3 feet at buoy 44027; plan window bites around peak flow at river mouths.
- Weather
- Winds 9 to 11 mph, air near 49°F, with 3 to 4 foot seas on the outer grounds.
New to these readings? What do water temp, cfs, tide, and moon phase actually mean for fishing?
What's Biting
Striped Bass
paddletails and bucktails on the tide at river mouths; clams off the beach
Atlantic Mackerel
tin jigs and fast-retrieve plugs
Flounder
sandworms and squid strips in inshore areas
Haddock
offshore bottom rigs when seas allow
What's Next
The full moon on May 31 sets up peak tidal exchanges through the first weekend of June, and that lunar timing is one of the most reliable triggers for Gulf of Maine striper action. Strong moving tides at river mouths, particularly the Merrimack where the herring run is still fully engaged per Surfland Bait and Tackle, should compress baitfish into predictable choke points and generate tight window bites on the outgoing and incoming flows. Plan around the tide peaks rather than the clock: the hour before and after max flow typically produces the most aggressive takes from bass stacked behind current seams and boulder structure.
The early pogy sightings reported by Capt. Tom of Beauport Fishing Adventures are an encouraging signal worth watching closely. If menhaden schools consolidate nearshore over the next several days, the average size of stripers in the region should ratchet up sharply. Large bunker attract large bass, and the On The Water striper migration map from May 29 places a significant wave of post-spawn fish still pushing north while feeding heavily on bunker, squid, and river herring. The Gulf of Maine is a logical next destination for that pod, with the leading edge likely arriving in force through early June.
Mackerel are showing in strong numbers per Belsan's Bait and Tackle, and when the bait is thick a wider range of presentations opens up: larger plugs, tin jigs, and fast-swimming paddle tails all draw strikes from bass chasing the baitfish. With water sitting at 47 to 48°F, stripers tend to run deeper at midday. Early morning and late evening remain the prime topwater windows near rip lines, while subsurface presentations through the middle of the day will keep you consistently in the strike zone. Inside the Merrimack, paddletails on leadheads have been the go-to presentation per Surfland Bait and Tackle, with SP Minnows and bucktails also drawing bites on the moving tide.
Flounder remains a reliable inshore backup for those who want to keep rods bent between striper windows. Offshore, Capt. Tom of Beauport Fishing Adventures was planning to run haddock this weekend, conditions permitting. The 3.9-foot wave heights logged at NOAA buoy 44007 indicate the outer grounds can get sporty; verify sea state before committing to any deeper water run.
Context
Water temperatures in the mid-to-upper 40s°F are squarely within the expected late-May range for the Gulf of Maine. The region consistently runs colder than the rest of the Northeast coast due to deep cold-water upwelling and a delayed spring warm-up cycle, so readings of 47 to 48°F at the offshore buoys are seasonally normal rather than unusually cold. Striper migration into the Gulf of Maine does not wait for southern New England temperature thresholds to be reached. Bass follow bait, and the herring runs that pulse through the Merrimack and other Gulf of Maine river systems each spring reliably draw fish north ahead of the water temperature curve.
The quality of the current bite described across multiple shops in The Fisherman — South Shore MA to ME mirrors a broader regional trend confirmed by The Fisherman (Northeast), which is tracking 40-pounders in Boston Harbor and fish approaching the 50-pound mark further south in Narragansett Bay. That scale of fish working north is consistent with a strong late-May migration pulse. The spring spawn from Hudson River and Chesapeake Bay systems typically pushes large adult stripers up the coast, reaching the Gulf of Maine in quantity by early June. Current reports suggest the leading edge of that wave has arrived on schedule or slightly early.
The second full moon of May coinciding with the late-May period aligns with what has historically been among the best striper fishing of the entire year in this region, when strong lunar tides intersect with the herring run peak. No direct year-over-year comparison figures from ME Sea Grant or a state agency source are available in the current intel set to benchmark this season quantitatively, so these observations reflect established Gulf of Maine seasonal patterns rather than a documented comparison against prior years.
This report is synthesized by Hooked Fisherman from real-time NOAA buoy data, USGS stream gauges, and current reports across regional fishing blogs, captain updates, and angler forums. Source names are cited inline where they appear. Check local regulations before keeping fish. Never trust a single source for a trip decision.