USDA Hardiness Zone 9a
Frost Dates for 85501 — Globe, Arizona
NOAA 1991–2020 normals from Globe #3, AZ (3,660 ft), 10 miles south.
Updated
In Globe, the last spring frost (32°F) is around March 11 in half of years and has passed by March 29 in nine years out of ten. The first fall frost comes around November 21, as early as November 6 one year in ten, leaving a typical freeze-free season of 253 days (NOAA, Globe #3, AZ).
- Last spring frost
- March 11
- First fall frost
- November 21
- Growing season
- 253 days
- Hardiness zone
- 9a
50% probability
50% probability
freeze-free, 50%
20 to 25°F (-6.7 to -3.9°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 0%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
0 of 19 observed
NOAA normal
Frost risk by date in Globe
Half of springs at Globe #3, AZ see their last 32°F night by March 11; only one in ten is past it by February 19, and one in ten still has one after March 29. Planting tender crops after March 18 leaves a 30% risk of a frost on them, after March 22 20%, and after March 29 10%. The 18 days between the even-odds date and the one-in-ten date is narrower than at 74% of the 98 Arizona stations behind this site's ZIP pages.
In fall the first 32°F night comes by November 21 in half of years, as early as November 6 one year in ten, and holds off past December 6 one year in ten. A hard freeze of 28°F follows 12 days later, around December 3; in spring the one-in-ten date for 28°F is March 11, 18 days before the 32°F one. The freeze-free season lasts 253 days in a typical year, longer than at 57% of the 98 Arizona stations; it reaches 278 days one year in ten and falls short of 228 one year in ten. On average 40 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 19 days longer, to about March 30, and return around November 12. Nights of 24°F, cold enough to damage hardier plants, come in 98% of winters and 16°F in 10%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Mar 12 | Mar 18 | Mar 22 | Mar 25 | Mar 30 | Apr 2 | Apr 6 | Apr 10 | Apr 18 |
| 32°F | Feb 19 | Feb 28 | Mar 4 | Mar 7 | Mar 11 | Mar 14 | Mar 18 | Mar 22 | Mar 29 |
| 28°F | Jan 23 | Feb 2 | Feb 9 | Feb 16 | Feb 21 | Feb 26 | Mar 2 | Mar 6 | Mar 11 |
| 24°F98% of yrs | Dec 28 | Jan 6 | Jan 11 | Jan 18 | Jan 24 | Feb 1 | Feb 7 | Feb 16 | Feb 24 |
| 20°F54% of yrs | Dec 15 | Dec 23 | Dec 30 | Jan 1 | Jan 5 | Jan 9 | Jan 15 | Jan 23 | Feb 4 |
| 16°F10% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 25 | Nov 1 | Nov 4 | Nov 9 | Nov 12 | Nov 14 | Nov 17 | Nov 20 | Nov 25 |
| 32°F | Nov 6 | Nov 12 | Nov 15 | Nov 18 | Nov 21 | Nov 24 | Nov 27 | Dec 1 | Dec 6 |
| 28°F | Nov 17 | Nov 23 | Nov 26 | Nov 30 | Dec 3 | Dec 6 | Dec 9 | Dec 13 | Dec 19 |
| 24°F98% of yrs | Nov 28 | Dec 4 | Dec 8 | Dec 12 | Dec 16 | Dec 20 | Dec 25 | Dec 30 | Jan 9 |
| 20°F54% of yrs | Dec 10 | Dec 15 | Dec 21 | Dec 26 | Dec 29 | Jan 1 | Jan 5 | Jan 11 | Jan 21 |
| 16°F10% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Globe #3, AZ, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 85501 →Compare Globe with another place →
Weather by month in Globe
July is the warmest month at Globe #3, AZ, averaging 97°F by day and 71°F at night; January is the coldest at 55°F and 33°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From April to October the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 75% of years.
Warmth for growing adds up to 5,597 growing degree days a year (base 50°F), fewer than at 53% of the 102 Arizona stations. 38% of them (2,116) have built up by the end of June, and July adds the most, 1,045. Precipitation totals 15.7 inches a year, most in July (2.7") and least in June (0.3"); May to September bring 41% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 55 | 33 | 2.1 | 100% | 14 | 8 |
| Feb | 59 | 36 | 1.9 | 95% | 8 | 51 |
| Mar | 68 | 41 | 1.0 | 75% | 1 | 167 |
| Apr | 76 | 47 | 0.4 | 8% | <1 | 357 |
| May | 85 | 55 | 0.4 | 0% | 0 | 619 |
| Jun | 97 | 65 | 0.3 | 0% | 0 | 915 |
| Jul | 97 | 71 | 2.7 | 0% | 0 | 1045 |
| Aug | 95 | 69 | 2.1 | 0% | 0 | 995 |
| Sep | 90 | 63 | 1.0 | 0% | 0 | 798 |
| Oct | 79 | 52 | 1.2 | 5% | <1 | 484 |
| Nov | 65 | 41 | 1.1 | 77% | 3 | 144 |
| Dec | 56 | 33 | 1.5 | 100% | 14 | 16 |
Monthly normals 1991–2020 at Globe #3, AZ (3,660 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Miami, AZ, 11 miles southwest of Globe, has a last frost 15 days earlier (February 24), a first frost 10 days later (December 1), a season 26 days longer.
When it snows in Globe, Arizona
Measurable snow is rare here: only 0 of 19 winters from 1991 to 2020 recorded 0.1 inch or more at Miami, AZ, 11.1 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 85501
| When | What to do |
|---|---|
| December 31 – January 14 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| January 14 – January 28 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| February 11 – February 25 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| March 11 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 29 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by November 7 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 21 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 85501 is 10 miles from Globe #3, AZ, which stands at 3,660 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 85501 in zone 9a, the band where the coldest night of the year averaged 20 to 25°F (-6.7 to -3.9°C) over 1991–2020; a zone describes winter lows, not frost dates.
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.