Mosquito Bay
Vieques bio bay moon calendar for 2026
Use the new moon as your planning anchor. The seven-night windows below cover the three nights before and after it.
The short answer
Pick the night closest to a new moon that fits your trip. Less moonlight usually gives the glow more contrast against the water. The bay still glows outside these windows, and cloud cover plus moonrise time can matter as much as the phase on a single night.
2026 darkest-night windows
Vieques local time| Month | Dark-window dates | Exact new moon | Next full moon |
|---|---|---|---|
| January | Jan 15-Jan 21 | ||
| February | Feb 14-Feb 20 | ||
| March | Mar 15-Mar 21 | ||
| April | Apr 14-Apr 20 | ||
| May | May 13-May 19 | ||
| June | Jun 11-Jun 17 | ||
| July | Jul 11-Jul 17 | ||
| August | Aug 9-Aug 15 | ||
| September | Sep 7-Sep 13 | ||
| October | Oct 7-Oct 13 | ||
| November | Nov 6-Nov 12 | ||
| December | Dec 5-Dec 11 |
2027 darkest-night windows
Vieques local time| Month | Dark-window dates | Exact new moon | Next full moon |
|---|---|---|---|
| January | Jan 4-Jan 10 | ||
| February | Feb 3-Feb 9 | ||
| March | Mar 5-Mar 11 | ||
| April | Apr 3-Apr 9 | ||
| May | May 3-May 9 | ||
| June | Jun 1-Jun 7 | ||
| July | Jun 30-Jul 6 | ||
| August | Jul 30-Aug 5 | ||
| August | Aug 28-Sep 3 | ||
| September | Sep 26-Oct 2 | ||
| October | Oct 26-Nov 1 | ||
| November | Nov 24-Nov 30 | ||
| December | Dec 24-Dec 30 |
Book the date before the operator
Hold your darkest available night first, then compare the licensed operators by price, boat type, and departure time. Tours often sell out around holidays and low-moon weekends.
Ferry schedules are published in limited date ranges and can change. Check the official month for your trip and confirm that your tour ends before treating a same-night return as possible.