USDA Hardiness Zone 6b
Frost Dates for 65584 — Saint Robert, Missouri
NOAA 1991–2020 normals from Waynesville 2 W, MO (890 ft), 5 miles west.
Updated
In Saint Robert, the last spring frost (32°F) is around April 15 in half of years and has passed by May 2 in nine years out of ten. The first fall frost comes around October 21, as early as October 6 one year in ten, leaving a typical freeze-free season of 185 days (NOAA, Waynesville 2 W, MO).
- Last spring frost
- April 15
- First fall frost
- October 21
- Growing season
- 185 days
- Hardiness zone
- 6b
50% probability
50% probability
freeze-free, 50%
-5 to 0°F (-20.6 to -17.8°C) coldest night
- First snow
- January 1
- Last snow
- January 29
- Winters with snow
- 92%
- Snow per year
- 10.2"
median, 1991–2020
median, 1991–2020
23 of 25 observed
NOAA normal
Frost risk by date in Saint Robert
Half of springs at Waynesville 2 W, MO see their last 32°F night by April 15; only one in ten is past it by March 29, and one in ten still has one after May 2. Planting tender crops after April 23 leaves a 30% risk of a frost on them, after April 27 20%, and after May 2 10%. The 17 days between the even-odds date and the one-in-ten date is wider than at 66% of the 158 Missouri stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 21 in half of years, as early as October 6 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 10 days later, around October 31; in spring the one-in-ten date for 28°F is April 20, 12 days before the 32°F one. The freeze-free season lasts 185 days in a typical year, shorter than at 79% of the 158 Missouri stations; it reaches 208 days one year in ten and falls short of 162 one year in ten. On average 110 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 13 days longer, to about April 28, and return around October 10. Severe cold of 16°F or below comes every winter, usually between December 3 and March 2.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 12 | Apr 17 | Apr 21 | Apr 25 | Apr 28 | Apr 30 | May 3 | May 7 | May 12 |
| 32°F | Mar 29 | Apr 3 | Apr 7 | Apr 11 | Apr 15 | Apr 18 | Apr 23 | Apr 27 | May 2 |
| 28°F | Mar 16 | Mar 23 | Mar 26 | Mar 30 | Apr 1 | Apr 5 | Apr 9 | Apr 13 | Apr 20 |
| 24°F | Mar 4 | Mar 10 | Mar 15 | Mar 18 | Mar 22 | Mar 26 | Mar 29 | Apr 2 | Apr 8 |
| 20°F | Feb 22 | Feb 28 | Mar 4 | Mar 8 | Mar 11 | Mar 15 | Mar 19 | Mar 23 | Mar 30 |
| 16°F | Feb 9 | Feb 17 | Feb 22 | Feb 27 | Mar 2 | Mar 5 | Mar 9 | Mar 14 | Mar 19 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 27 | Oct 2 | Oct 5 | Oct 8 | Oct 10 | Oct 13 | Oct 16 | Oct 19 | Oct 23 |
| 32°F | Oct 6 | Oct 11 | Oct 15 | Oct 18 | Oct 21 | Oct 23 | Oct 26 | Oct 29 | Nov 1 |
| 28°F | Oct 16 | Oct 22 | Oct 25 | Oct 28 | Oct 31 | Nov 2 | Nov 4 | Nov 7 | Nov 14 |
| 24°F | Oct 28 | Nov 1 | Nov 4 | Nov 6 | Nov 9 | Nov 13 | Nov 17 | Nov 23 | Nov 28 |
| 20°F | Nov 5 | Nov 9 | Nov 14 | Nov 18 | Nov 22 | Nov 27 | Dec 1 | Dec 4 | Dec 10 |
| 16°F | Nov 14 | Nov 21 | Nov 26 | Nov 29 | Dec 3 | Dec 7 | Dec 11 | Dec 17 | Dec 23 |
Freeze probabilities 1991–2020 at Waynesville 2 W, MO, 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 65584 →Compare Saint Robert with another place →
Weather by month in Saint Robert
July is the warmest month at Waynesville 2 W, MO, averaging 89°F by day and 67°F at night; January is the coldest at 44°F and 22°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 83% of years and May still brings one in 13% of years.
Warmth for growing adds up to 4,210 growing degree days a year (base 50°F), more than at 71% of the 158 Missouri stations. 37% of them (1,565) have built up by the end of June, and July adds the most, 868. Precipitation totals 47.6 inches a year, most in May (5.2") and least in January (2.7"); May to September bring 48% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 44 | 22 | 2.7 | 100% | 26 | 12 |
| Feb | 49 | 26 | 2.7 | 100% | 22 | 23 |
| Mar | 59 | 34 | 4.1 | 100% | 15 | 89 |
| Apr | 69 | 44 | 4.8 | 83% | 5 | 250 |
| May | 77 | 54 | 5.2 | 13% | <1 | 478 |
| Jun | 85 | 63 | 4.7 | 0% | 0 | 712 |
| Jul | 89 | 67 | 4.3 | 0% | 0 | 868 |
| Aug | 89 | 65 | 4.6 | 0% | 0 | 832 |
| Sep | 81 | 56 | 4.2 | 3% | <1 | 567 |
| Oct | 71 | 45 | 3.6 | 86% | 4 | 278 |
| Nov | 58 | 35 | 3.8 | 100% | 15 | 82 |
| Dec | 48 | 27 | 2.9 | 100% | 23 | 18 |
Monthly normals 1991–2020 at Waynesville 2 W, MO (890 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, Fort Leonard Wood, MO, 6 miles south of Saint Robert and 233 feet higher, has a last frost 1 day earlier (April 14), a first frost 3 days later (October 24), a season 8 days longer.
When it snows in Saint Robert, Missouri
The first measurable snow (0.1 inch or more) in Saint Robert usually arrives around January 1, and the last of the season around January 29. Those are the middle dates across the winters of 1991–2020 at Waynesville 2 W, MO, 5.3 miles away: half of years saw snow earlier, half later. Snow fell in 92% of those winters. The last 32°F night of spring typically comes 76 days after the last snow.
Planting calendar for 65584
| When | What to do |
|---|---|
| February 4 – February 18 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 18 – March 4 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 18 – April 1 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 15 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 29 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 7 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 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 65584 is 5 miles from Waynesville 2 W, MO, which stands at 890 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 65583 (Waynesville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 65584 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°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.