Acadia's best remaining daylight tide-pool window of summer 2026 is Saturday, August 15: a −0.80 ft low at 7:16 AM at NOAA station 8413320 (Bar Harbor), with workable water from 5:45 to 8:40 AM. August serves up 10 daylight minus tides, and the standout run is August 13–16. The Bar Island land bridge runs on a stricter clock: the National Park Service says the bar is exposed for 1.5 hours either side of low tide. Miss it, and you wait 9 hours.
Acadia has three classic tide-pool venues, and one tide table governs all of them: Bar Island's gravel land bridge on the north side of Mount Desert Island, and the Ship Harbor and Wonderland trails on the quiet southwest corner. Our numbers below come from NOAA predictions for station 8413320, the reference station our Bar Harbor station page uses for all three spots.
Which 2026 low tides are worth planning around?
Bar Harbor's tide range is large, so plenty of lows are decent. The scarce commodity is a minus tide that lands in daylight. Here are the eight best windows in the next 60 days, scored 0–100 on depth, daylight overlap, and timing (computed 2026-07-24 from NOAA station 8413320 predictions):
| Date | Low (ft MLLW) | Low time | Walkable window | Arrive by | Daylight in window | Score |
|---|---|---|---|---|---|---|
| Sat, Aug 15 | −0.80 | 7:16 AM | 5:45–8:40 AM | 6:16 AM | 175 min | 75 (Great) |
| Fri, Aug 14 | −1.07 | 6:29 AM | 4:50–8:05 AM | 5:29 AM | 150 min | 71 (Good) |
| Sun, Aug 16 | −0.34 | 8:02 AM | 6:45–9:15 AM | 7:02 AM | 150 min | 62 (Good) |
| Thu, Aug 13 | −1.12 | 5:40 AM | 4:00–7:15 AM | 4:40 AM | 101 min | 59 (Fair) |
| Fri, Sep 11 | −0.48 | 5:40 PM | 4:20–7:00 PM | 4:40 PM | 151 min | 58 (Fair) |
| Sat, Sep 12 | −0.51 | 6:27 PM | 5:00–7:45 PM | 5:27 PM | 109 min | 56 (Fair) |
| Fri, Aug 14 | −0.33 | 6:47 PM | 5:30–8:05 PM | 5:47 PM | 129 min | 53 (Fair) |
| Sat, Sep 12 | −0.61 | 6:05 AM | 4:40–7:25 AM | 5:05 AM | 77 min | 53 (Fair) |
The pattern to notice: mid-August gives you four consecutive minus-tide mornings, August 13 through 16, with the low arriving 45–50 minutes later each day. The deepest water (−1.12 ft, August 13) comes at 5:40 AM with only 101 of its window minutes in daylight, which is why it scores a Fair 59; the best all-around morning (Saturday, August 15) trades a third of a foot of depth for a civilized 7:16 AM low and 175 daylight minutes. It is also the only weekend window in the next 60 days that scores 75 or better. After that run the calendar flips: the next windows to make the table, September 11 and 12, are evening lows. And if you're in the park before the run starts, late July is honest-to-goodness thin — zero daylight minus tides remain in July, and the month's best remaining window (July 31, +0.22 ft at 6:42 AM) scores just 41. Day-by-day detail is on the August calendar.
How long do you really have on the Bar Island land bridge?
This is the one Acadia tide question where the clock is a safety matter, so here is the National Park Service, verbatim: "For 1.5 hours before and after low tide, a gravel bar is exposed connecting the town of Bar Harbor and Bar Island." And the consequence of overstaying, also verbatim: "If you walk over to the island and lose track of time, it is 9 hours until the bar emerges again to safely walk across."
That is a 3-hour budget, total, for a hike NPS lists at 1.9 miles round trip (gravel bar plus island trail). Applying the NPS rule to the fact-sheet lows, the crossing periods for the mid-August run work out to:
| Date | Predicted low | NPS crossing period (low ± 1.5 h) |
|---|---|---|
| Thu, Aug 13 | 5:40 AM | ~4:10–7:10 AM |
| Fri, Aug 14 | 6:29 AM | ~4:59–7:59 AM |
| Sat, Aug 15 | 7:16 AM | ~5:46–8:46 AM |
| Sun, Aug 16 | 8:02 AM | ~6:32–9:32 AM |
Low-tide times computed 2026-07-24 from NOAA station 8413320 predictions; the ±1.5 h rule is NPS guidance, not ours. Note how closely the August 15 crossing period (5:46–8:46 AM) matches our height-based window for that morning (5:45–8:40 AM) — on a minus tide the two clocks agree, which is part of why that day scores 75.
Access is simple: per NPS, "Start the hike by walking down Bridge Street from West Street in downtown Bar Harbor." The practical habit that keeps you off the 9-hour naughty list is the one our Tide Window Finder bakes in as the arrive-by time: get there an hour before the low (6:16 AM on August 15), walk out on a falling tide, and start back no later than the low itself if you want margin.
Do Ship Harbor and Wonderland follow the same clock?
Yes. NPS's tidepooling guidance for Acadia is the same window as the bar: "The opportunity to tidepool occurs between the window of time 1.5 hours before to 1.5 hours after low tide." The difference is stakes. At Ship Harbor and Wonderland nobody gets stranded; a rising tide just closes the pools.
Both trailheads sit on Maine Route 102A (Seawall Road) on the island's southwest side. Ship Harbor is, in NPS's words, "a figure-8 trail covering 1.3 miles," with the pools at the rocky far loop; Wonderland is 1.4 miles round trip on an old gravel fire road that ends at the shore. They are close enough together that one minus tide covers both, though with a 3-hour window you'll do one properly rather than two hurriedly.
For these two, the fact sheet's month-by-month view is the useful planning grain (computed 2026-07-24 from NOAA station 8413320 predictions; July is omitted now that its minus tides are behind us):
| Month (2026) | Lows below +1.0 ft | Daylight windows | Daylight minus tides | Best window |
|---|---|---|---|---|
| August | 41 | 25 | 10 | Sat 8/15, −0.80 ft, 7:16 AM (75) |
| September | 38 | 21 | 10 | Fri 9/11, −0.48 ft, 5:40 PM (58) |
| October | 40 | 14 | 7 | Sun 10/25, −0.55 ft, 4:43 PM (59) |
| November | 39 | 14 | 8 | Sun 11/22, −0.27 ft, 2:27 PM (55) |
| December | 43 | 16 | 8 | Wed 12/23, −1.38 ft, 3:48 PM (58) |
Two things fall out of that table. First, summer is morning country and fall is afternoon country: August's best window is before 9 AM, every one September onward is after 2 PM. Second, the deepest daylight low of all of 2026 is not in summer — it's −1.65 ft on December 24 at 4:41 PM, though only 68 minutes of that window overlap daylight, which is why it scores a modest 55. The king-tide season goes lower still: Saturday, January 23, 2027 brings a −1.89 ft daylight low at 5:20 PM, the lowest of the October-to-March stretch. Details on the 2026–2027 king tides page.
What's in the pools, and what are the rules?
Observers within 5 km of the station logged these most often over the last 60 days (station data refreshed 2026-07-24): Common Periwinkle (22 observations), Atlantic Dogwhelk (11), Atlantic Jackknife (11), Common Atlantic Slippersnail (9), and the barnacle-eating dorid Onchidoris bilamellata (6). Snail-heavy, in other words, with a nudibranch for the patient.
The park's rules, quoted from the NPS tidepooling page: "Leave the park as you found it – collection is prohibited." "Never use force to remove anything. Replace animals where you find them." And on footing: "Black rocks and seaweed are especially slippery, and shells are hard and jagged." Closed-toe shoes with traction are the NPS recommendation for the bar itself, too.
If you want the arrive-by time for any date beyond the eight above, the Tide Window Finder computes it for every upcoming window at this station, and the methodology page shows exactly how the 0–100 scores are built. Mid-August, before 9 AM, an hour early: that's the whole trick.