Fall in zone 6aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 93546 (Mammoth Lakes, CA)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Mammoth Lakes Rs, CA (10 miles away).
- Average last spring frostJun 1050% chance of a 32°F freeze after this date
- Average first fall frostSep 1750% chance of a 32°F freeze by this date
- Growing season (frost-free)98 daysmedian, 32°F threshold
- USDA hardiness zone6a-10 to -5°F avg. coldest night
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This week in your yard
As of Oct 18, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
50°F 50–55°F
24-hour average · latest 53°F, as of Oct 18, 2:00 AM CDT
Measured at USDA NRCS SCAN station Doe Ridge, 6 mi away. Daily averages: Thu 51°, Fri 50°, Sat 50°.
4-inch depth
52°F 50–55°F
24-hour average · latest 55°F, as of Oct 18, 2:00 AM CDT
Measured at USDA NRCS SCAN station Doe Ridge, 6 mi away. Daily averages: Thu 53°, Fri 53°, Sat 52°.
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
The latest National Weather Service 7-day forecast and any Frost Advisory or Freeze Warning for 93546 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 52°F at 4 inches. Fall pre-emergent window is mostly past. Next: spring, when soil reaches 50°F (typically March to April).
Fertilizer window
Lawn region: Pacific Northwest (west of the Cascades). Timing only; always follow the product label.
- Perennial ryegrass (cool-season): Early fall: September; Late fall: October–November; Overseeded Bermuda: Light feeding once the winter rye is established, if needed. Avoid: Summer feeding.
Plant now
No vegetable planting windows are open this week.
Prune now
No frost-timed pruning windows are open this week.
Spring-flowering shrubs are pruned right after their flowers fade, not by date. See the pruning guide.
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | May 29 |
| 50% (the "average" last frost) | Jun 10 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 30 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Sep 2 |
| 50% (the "average" first frost) | Sep 17 |
| 90% (late: most years have frozen by now) | Oct 2 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | n/a | n/a |
| 32°F (freeze) | Jun 10 | Sep 17 |
| 28°F (hard freeze) | May 31 | Oct 1 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
Vegetable planting calendar for 93546
Dates count from your average last spring frost (Jun 10) and first fall frost (Sep 17). Half of years have a frost after the spring date, so give tender crops (tomatoes, peppers, squash) some slack.
| Crop | Start indoors | Spring planting | Fall planting |
|---|---|---|---|
| Tomato | Apr 15–29 | Jun 17–Jul 1 (transplant) | – |
| Pepper (sweet and hot) | Apr 1–15 | Jun 24–Jul 8 (transplant) | – |
| Eggplant | Apr 1–15 | Jun 24–Jul 8 (transplant) | – |
| Tomatillo | Apr 15–29 | Jun 17–Jul 1 (transplant) | – |
| Lettuce | Apr 15–29 | May 20–Jun 10 (transplant) May 13–Jun 24 (sow outdoors) | Jul 23–Aug 13 (transplant) Jul 9–Aug 6 (sowing) |
| Spinach | – | Apr 29–May 20 (sow outdoors) | Jul 23–Aug 13 (sowing) |
| Kale | Apr 15–29 | May 13–27 (transplant) May 13–27 (sow outdoors) | Jun 25–Jul 23 (transplant) Jun 11–Jul 9 (sowing) |
| Collards | Apr 15–29 | May 13–Jun 10 (transplant) May 13–Jun 10 (sow outdoors) | Jun 25–Jul 23 (transplant) Jun 11–Jul 9 (sowing) |
| Broccoli | Apr 1–15 | May 13–27 (transplant) | Jun 11–Jul 9 (transplant) |
| Cabbage | Apr 1–15 | May 13–27 (transplant) | Jun 11–Jul 9 (transplant) |
| Cauliflower | Apr 1–15 | May 27–Jun 10 (transplant) | Jun 11–Jul 9 (transplant) |
| Brussels sprouts | Mar 18–Apr 1 | May 13–27 (transplant) | May 28–Jun 18 (transplant) |
| Kohlrabi | Apr 15–29 | May 13–27 (transplant) May 13–27 (sow outdoors) | Jul 9–23 (sowing) |
| Bok choy / Asian greens | – | May 13–27 (sow outdoors) | Jul 23–Aug 6 (sowing) |
| Arugula | – | May 13–Jun 10 (sow outdoors) | Jul 23–Aug 20 (sowing) |
| Mustard greens | – | May 13–Jun 3 (sow outdoors) | Jul 23–Aug 6 (sowing) |
| Swiss chard | Apr 29–May 13 | May 27–Jun 17 (transplant) May 27–Jun 24 (sow outdoors) | Jul 9–23 (sowing) |
| Beet | – | May 13–Jun 10 (sow outdoors) | Jul 9–23 (sowing) |
| Carrot | – | May 20–Jun 17 (sow outdoors) | Jun 25–Jul 9 (sowing) |
| Radish | – | May 6–Jun 17 (sow outdoors) | Aug 6–20 (sowing) |
| Turnip | – | May 13–Jun 3 (sow outdoors) | Jul 9–23 (sowing) |
| Parsnip | – | May 20–Jun 10 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 15–May 13 (sow outdoors) | Jun 25–Jul 9 (sowing) |
| Onion (bulbing) | Mar 18–Apr 1 | Apr 29–May 13 (transplant) | – |
| Green onion / scallion | – | Apr 29–May 27 (sow outdoors) | Jul 9–23 (sowing) |
| Leek | Mar 18–Apr 1 | May 13–27 (transplant) | – |
| Garlic | – | – | Aug 6–Sep 3 (sowing) |
| Shallot | – | Apr 29–May 13 (transplant) | Aug 6–Sep 3 (sowing) |
| Potato | – | May 13–27 (transplant) | May 28–Jun 11 (transplant) |
| Sweet potato | – | Jul 1–15 (transplant) | – |
| Sweet corn | – | Jun 17–Jul 1 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 17–Jul 1 (sow outdoors) | – |
| Bean, pole | – | Jun 17–Jul 1 (sow outdoors) | – |
| Lima bean | – | Jun 24–Jul 8 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jul 1–22 (sow outdoors) | – |
| Cucumber | May 13–20 | Jun 17–Jul 1 (transplant) Jun 17–Jul 1 (sow outdoors) | – |
| Summer squash / zucchini | May 13–20 | Jun 17–Jul 1 (transplant) Jun 17–Jul 1 (sow outdoors) | – |
| Winter squash | May 13–20 | Jun 17–Jul 1 (transplant) Jun 17–Jul 1 (sow outdoors) | – |
| Pumpkin | – | Jun 17–Jul 1 (sow outdoors) | – |
| Watermelon | May 13–20 | Jun 24–Jul 8 (transplant) Jun 24–Jul 8 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 13–20 | Jun 24–Jul 8 (transplant) Jun 24–Jul 8 (sow outdoors) | – |
| Okra | Apr 29–May 13 | Jun 24–Jul 8 (transplant) Jun 24–Jul 8 (sow outdoors) | – |
| Celery | Mar 18–Apr 1 | Jun 17–24 (transplant) | – |
| Basil | Apr 29–May 13 | Jun 17–Jul 1 (transplant) Jun 17–Jul 1 (sow outdoors) | – |
| Cilantro | – | May 27–Jun 24 (sow outdoors) | Jul 23–Aug 6 (sowing) |
| Parsley | Apr 1–15 | May 27–Jun 10 (transplant) May 20–Jun 10 (sow outdoors) | – |
| Dill | – | Jun 10–24 (sow outdoors) | Jul 23–Aug 6 (sowing) |
| Sunflower | – | Jun 10–24 (sow outdoors) | – |
| Asparagus (crowns) | – | May 13–27 (transplant) | – |
| Rhubarb (crowns) | – | May 13–27 (transplant) | – |
| Strawberry (plants) | – | May 13–27 (transplant) | Jul 9–Aug 6 (transplant) |
Typical ranges from university extension planting calendars, adjusted to your frost dates. Probabilities, not guarantees. Fall windows that would overlap spring planting are left out, as are fall crops of frost-tender plants where the frost-free season is under 210 days.
Where these numbers come from
Station: Mammoth Lakes Rs, CA (NOAA GHCN-Daily ID USC00045280), elevation 7,804 ft, 9.6 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Bishop AP, CA | 29 mi | Apr 29 | Oct 15 |
| Huntington Lake, CA | 31 mi | Jun 1 | Oct 6 |
| Lee Vining, CA | 32 mi | May 23 | Oct 9 |
The average last-frost dates of these stations span 43 days, a rough guide to local variation. See data sources & methods.
Frost questions for 93546
When is the last frost in 93546?
The average (50% chance) last spring freeze of 32°F for ZIP 93546 is June 10. For a more cautious planting date, use June 30, when only 1 year in 10 still sees a later freeze.
When is the first frost in 93546?
The average first fall freeze is September 17. In 1 year in 10 it comes by September 2.
What hardiness zone is 93546?
ZIP 93546 is in USDA zone 6a (-10 to -5°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 93546 right now?
This page shows the latest 2-inch and 4-inch soil temperature from the nearest public soil station (USDA SCAN, NOAA USCRN or TexMesonet), or a labeled estimate when no station is close, against the 50–55°F spring pre-emergent band.
Nearby ZIP codes
93634 93529 June Lake 93514 Chalfant 93512 Benton 93605 Big Creek 93541 Mono City 95389 Yosemite Valley 93664 Shaver Lake
Other ZIP codes in Mono County
93512 93514 93517 93529 93541 96107 96133 All Mono County frost dates · California frost dates
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Free. One weekly email plus alerts when your ZIP has a frost or a soil-temperature change worth acting on. After you submit, Kit (our email provider) sends a confirmation email: check your email and click the link to confirm. You aren't subscribed until you do. We collect only your email address and ZIP, sent to Kit to deliver The Dial. Unsubscribe anytime.