What to do in Honolulu now
Honolulu is in warm-season grass country. Dates are typical for this spot, worked out from 23 years of weather at Honolulu Intl Ap; each status uses this year's soil estimates.
Cool-season: tall fescue, Kentucky bluegrass, perennial ryegrass, fine fescue
- Crabgrass pre-emergent No clear spring window Typical: Soil rarely drops below 55°FSoil here stays warm enough for crabgrass to sprout in most months. Extension calendars in frost-free areas usually time a late-winter pre-emergent application by date rather than by soil temperature.
- Seed or overseed Soil rarely cools enough Typical: –4-inch soil here seldom falls into the 55–70°F seeding range for long. Cool-season grasses struggle in this climate; tall fescue is the usual exception, seeded in the coolest months.
- Late-fall feeding Soil rarely cools to 40°F Typical: Through winterRoots stay active through most winters here. Feed on the fall schedule your extension office gives for your grass, and avoid feeding a lawn that is dormant from drought.
Warm-season: bermudagrass, zoysia, St. Augustine, centipede, bahia
- Crabgrass pre-emergent No clear spring window Typical: Soil rarely drops below 55°FSoil here stays warm enough for crabgrass to sprout in most months. Extension calendars in frost-free areas usually time a late-winter pre-emergent application by date rather than by soil temperature.
- Seed or sod Too cool for warm-season grass Typical: –4-inch soil rarely holds 65°F here for long enough. Bermudagrass and other warm-season grasses are not a good fit; choose a cool-season grass.
- Dormancy Rarely goes dormant Typical: Grows most of the yearSoil stays warm enough here that warm-season grass slows in winter rather than going fully dormant.
The last 60 days and the week ahead
Honolulu soil is 0° warmer than normal for Nov 2, warmer than on 52% of those dates since 2005, and 0° warmer than a year ago.
The green line is our estimate of the daily average soil temperature 2 inches down, driven by temperatures at Honolulu Intl Ap, 9.5 km from the city center. The dashed part runs the National Weather Service forecast through the same model. Hover or tap for any day.
2-inch soil, estimated From the NWS forecast Normal Normal range (8 years in 10)
Show the numbers
| Date | 2-inch soil | 4-inch soil | Air high / low | Normal (2 in) |
|---|---|---|---|---|
| Oct 13 | 81° | 82° | 87° / 75° | 81° |
| Oct 14 | 81° | 82° | 87° / 72° | 81° |
| Oct 15 | 81° | 82° | 88° / 76° | 81° |
| Oct 16 | 81° | 83° | 88° / 76° | 81° |
| Oct 17 | 81° | 82° | 86° / 75° | 81° |
| Oct 18 | 81° | 82° | 86° / 75° | 81° |
| Oct 19 | 81° | 82° | 87° / 75° | 81° |
| Oct 20 | 81° | 82° | 85° / 76° | 80° |
| Oct 21 | 81° | 82° | 86° / 75° | 80° |
| Oct 22 | 80° | 82° | 86° / 71° | 80° |
| Oct 23 | 80° | 81° | 86° / 71° | 80° |
| Oct 24 | 79° | 81° | 87° / 71° | 80° |
| Oct 25 | 79° | 81° | 86° / 72° | 80° |
| Oct 26 | 79° | 80° | 85° / 70° | 80° |
| Oct 27 | 79° | 80° | 83° / 74° | 80° |
| Oct 28 | 78° | 80° | 82° / 72° | 80° |
| Oct 29 | 78° | 80° | 82° / 75° | 80° |
| Oct 30 | 79° | 80° | 85° / 76° | 80° |
| Oct 31 | 79° | 81° | 86° / 76° | 79° |
| Nov 1 | 80° | 81° | 85° / 75° | 79° |
| Nov 2 | 79° | 81° | 84° / 75° | 79° |
Which grass grows in Honolulu
With mild winters (January averages 74°F), most Honolulu lawns are warm-season grasses such as bermudagrass, St. Augustine, zoysia and centipede. They grow through summer and slow or go dormant in winter.
Honolulu soil through the year
Weekly 2-inch estimates for 2026 so far against 2025 and the normal for each week. The red lines mark 50°F, when crabgrass pre-emergent should be down, and 65°F, when warm-season seed sprouts well.
2026 2025 Normal (2005–2025) 8 years in 10
Normal by month
| Month | 2 in | 4 in | Air |
|---|---|---|---|
| Jan | 73° | 74° | 74° |
| Feb | 73° | 75° | 74° |
| Mar | 75° | 76° | 75° |
| Apr | 77° | 79° | 77° |
| May | 79° | 81° | 78° |
| Jun | 82° | 83° | 80° |
| Jul | 83° | 85° | 82° |
| Aug | 84° | 85° | 82° |
| Sep | 83° | 84° | 82° |
| Oct | 81° | 82° | 80° |
| Nov | 78° | 79° | 78° |
| Dec | 75° | 76° | 76° |
Soil: average of our daily estimates, 2005–2025. Air: NOAA 1991–2020 normals for the station.
Typical lawn dates in Honolulu
Each date is when the soil estimate (or the air, for freezes) crossed the threshold, year by year since 2005. “Early” and “late” are the 10th and 90th percentile years, so 8 years in 10 fall between them.
| Event | Typical | 2026 |
|---|---|---|
| Crabgrass model: 250 growing degree days | Jan 6 | Jan 6 |
| Pre-emergent window opens (2-inch soil 50°F) | early Feb | Feb 1 |
| Crabgrass begins to sprout (2-inch soil 55°F) | Feb 15 | Feb 15 |
| Cool-season lawns start growing (4-inch soil 55°F) | Feb 1 | Feb 1 |
| Warm-season seeding opens (4-inch soil 65°F) | Feb 1 | Feb 1 |
Where these numbers come from
There is no soil sensor in most cities, so we estimate it. Shallow soil follows air temperature with a lag of a few days, and runs a little warmer than the air in fall. We fitted that relationship to 190 USDA soil-sensor stations; on years held out of the fit, the estimate was off by 3.3°F on an average day, and it put the spring 55°F date within a median of 3 days. Read the methodology.
Weather: RCC ACIS station PHNL (HONOLULU INTL AP), daily data since 1940. Forecast: National Weather Service, HFO office, issued Nov 3, 2026, 11:01 PM EST. Last observed day: Nov 2, 2026.
Honolulu questions
What is the soil temperature in Honolulu today? Our estimate for Nov 2 is 79°F at 2 inches and 81°F at 4 inches, as a daily average. Early-morning soil runs a few degrees cooler than that, and afternoon soil warmer.
When should I put down crabgrass pre-emergent in Honolulu? Soil here rarely cools below 55°F, so there is no clean spring window; frost-free areas usually apply in late winter by calendar date.
When can I seed bermudagrass in Honolulu? Too cool for warm-season grass. 4-inch soil rarely holds 65°F here for long enough. Bermudagrass and other warm-season grasses are not a good fit; choose a cool-season grass.
Is it too late to fertilize in Honolulu? Rarely goes dormant. Soil stays warm enough here that warm-season grass slows in winter rather than going fully dormant.
When is the last frost in Honolulu? The last 32°F night of spring has typically come around , and as late as in 1 year in 10. The first fall freeze typically arrives around .
Why 2 inches and 4 inches? Crabgrass and most weed seeds sprout in the top inch or two, so pre-emergent timing follows 2-inch soil. Grass seed and roots respond to the slightly steadier soil at about 4 inches.
How accurate is this? It is a model, not a probe in your yard. Expect about 3–4°F of difference on a given day; shade, slope, mulch and irrigation all move real soil. The dates and trends are more reliable than any single day.