When to plant in Waialua, HI
Planting dates worked out from Waialua's own frost records, not a generic zone chart.
Frost is rare in Waialua: in 27 of the last 27 springs there was none at all. Frost dates matter less here than heat, so the planting table below is left out.
Safe to plant out
Jan 1
1 year in 10 has a later frost
Average last frost
Jan 1
about a 50% chance of a later one
Average first fall frost
Dec 31
1 year in 10 by Dec 31
Frost-free days
363
median, 1991–2020
Station used: Waimea Valley 892.2 · 10.5 km away · station 12 m, town 8 m. How we match towns to stations
Waialua's weather over time
How the growing season has shifted here, year by year, from the station's own records.
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1984 | 363 |
| 1985 | 363 |
| 1986 | 363 |
| 1987 | 363 |
| 1988 | 363 |
| 1989 | 363 |
| 1990 | 363 |
| 1991 | 363 |
| 1992 | 363 |
| 1993 | 363 |
| 1994 | 363 |
| 1995 | 363 |
| 1996 | 363 |
| 1997 | 363 |
| 1998 | 363 |
| 1999 | 363 |
| 2000 | 363 |
| 2001 | 363 |
| 2002 | 363 |
| 2003 | 363 |
| 2004 | 363 |
| 2005 | 363 |
| 2006 | 363 |
| 2007 | 363 |
| 2008 | 363 |
| 2009 | 363 |
| 2010 | 363 |
| 2011 | 363 |
| 2012 | 363 |
| 2014 | 363 |
| 2017 | 363 |
| 2020 | 363 |
| 2021 | 363 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1984 | 25.1 °C |
| 1985 | 24.1 °C |
| 1986 | 24.1 °C |
| 1987 | 23.9 °C |
| 1988 | 24.1 °C |
| 1989 | 23.9 °C |
| 1990 | 25.2 °C |
| 1991 | 25.6 °C |
| 1992 | 23.9 °C |
| 1993 | 25.0 °C |
| 1994 | 25.1 °C |
| 1995 | 24.7 °C |
| 1996 | 25.5 °C |
| 1997 | 24.5 °C |
| 1998 | 24.1 °C |
| 1999 | 24.3 °C |
| 2000 | 24.7 °C |
| 2001 | 24.7 °C |
| 2002 | 25.0 °C |
| 2003 | 25.4 °C |
| 2004 | 25.5 °C |
| 2005 | 25.7 °C |
| 2006 | 25.1 °C |
| 2007 | 24.8 °C |
| 2008 | 25.1 °C |
| 2009 | 25.0 °C |
| 2010 | 24.5 °C |
| 2011 | 23.7 °C |
| 2012 | 23.4 °C |
| 2013 | 23.7 °C |
| 2014 | 24.5 °C |
| 2015 | 25.0 °C |
| 2017 | 24.9 °C |
| 2020 | 24.8 °C |
What this means for you: This station's record is too short to show a reliable trend yet.
Source: daily records from Waimea Valley 892.2 (NOAA GHCN-Daily). Years with too many missing days are left out.