| 100% | TET | 3 | First day of spring, to Vietnamese |
| 66% | TET | 3 | First day of spring, in Hanoi |
| 63% | TET | 3 | Holiday celebrating the first day of spring |
| 60% | CALENDS | 7 | First day of a month, according to ancient Romans |
| 54% | MON | 3 | First day of the week, for short (start to 15a, 30a, 41a, 42a, 47a, 19d, and 22d) |
| 52% | TREE | 4 | "On the first day of Christmas, my true love sent to me, a partridge in a pear ___..." |
| 50% | ASHWEDNESDAY | 12 | First day of Lent |
| 49% | WEDNESDAY | 9 | First day of Lent: Ash __ |
| 49% | TET | 3 | Vietnamese holiday whose full name translates to "festival of the first day" |
| 49% | MONDAY | 6 | First day of the work week |
| 49% | MON | 3 | First day of most workweeks: Abbr. |
| 48% | MON | 3 | First day of the work week: Abbr. |
| 48% | MON | 3 | First day of the workweek, typically (abbr.) |
| 48% | MON | 3 | First day of the workweek, typically: Abbr. |
| 48% | SAT | 3 | First day of the weekend, for short |
| 48% | WEDNESDAY | 9 | Ash __, first day of Lent |
| 48% | ASH | 3 | ___ Wednesday, first day of Lent |
| 47% | CALENDS | 7 | First day of the month, in ancient Rome |
| 47% | BUTWHYCANTIWEARIT | 17 | ...on the first day of school |
| 47% | ASH | 3 | ___ Wednesday (the first day of Lent) |
| 47% | ARIES | 5 | First sign of spring |
| 47% | ARIES | 5 | First sign of spring? |
| 46% | MON | 3 | First day of the work week usually, for short |
| 46% | PARTRIDGE | 9 | First day of Christmas present in a pear tree |
| 46% | CALENDS | 7 | First day of the month in Ancient Roman calendar |
| 46% | TET | 3 | First day of the Lunar New Year, in Vietnam |
| 46% | MAYDAY | 6 | The first day of the fifth month |
| 46% | JOANBAEZ | 8 | *Singer on the first day of Woodstock |
| 46% | SHANATOVA | 9 | Greeting on the first day of Tishri |
| 46% | ASHES | 5 | Symbol on the first day of Lent |